UI Components Easy

Banking — OTP / 2FA Input

A trust-first six-digit OTP and two-factor verification screen for banking and fintech flows. Boxes auto-advance as you type, accept a full pasted code, and support an optional masked mode for shoulder-surfing safety. A resend countdown timer throttles new codes, while clear error and success states confirm whether the entered code matches. Includes an encrypted badge, accessible inputs, keyboard navigation, tabular figures, and a responsive layout that holds together down to small mobile widths.

Open in Lab

html css vanilla-js

Targets: JS HTML

Code

:root {
  --navy: #0e1b3a;
  --navy-2: #16264d;
  --ink: #0e1726;
  --ink-2: #3a4660;
  --muted: #697089;
  --accent: #3b6ef6;
  --accent-d: #2a55cc;
  --accent-50: #eaf0ff;
  --teal: #0fb5a6;
  --violet: #7c5cff;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --line: rgba(14, 27, 58, 0.1);
  --line-2: rgba(14, 27, 58, 0.18);
  --ok: #1f9d62;
  --warn: #d9982b;
  --danger: #d4493e;
  --credit: #1f9d62;
  --debit: #0e1726;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --sh-1: 0 1px 2px rgba(14, 27, 58, 0.06);
  --sh-2: 0 8px 24px rgba(14, 27, 58, 0.1);
  --sh-3: 0 24px 60px rgba(14, 27, 58, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
  color: var(--ink);
  background:
    radial-gradient(120% 80% at 80% -10%, rgba(59, 110, 246, 0.1), transparent 60%),
    radial-gradient(100% 70% at -10% 110%, rgba(124, 92, 255, 0.08), transparent 55%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 18px;
}

/* ---------- card ---------- */
.card {
  width: 100%;
  max-width: 432px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-3);
  overflow: hidden;
}

.card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  background: linear-gradient(180deg, var(--navy), var(--navy-2));
  color: #fff;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand__mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.12);
  color: #cfe0ff;
}

.brand__name {
  font-size: 15px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.pill--secure {
  background: rgba(15, 181, 166, 0.16);
  color: #8af0e5;
  border: 1px solid rgba(15, 181, 166, 0.35);
}

.card__body {
  padding: 26px 26px 22px;
}

.step {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--accent-d);
  background: var(--accent-50);
  padding: 4px 10px;
  border-radius: 999px;
}

.title {
  margin: 14px 0 8px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.lede {
  margin: 0 0 22px;
  font-size: 14px;
  color: var(--muted);
}

.lede strong {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* ---------- otp ---------- */
.otp {
  border: 0;
  margin: 0;
  padding: 0;
}

.otp__boxes {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: space-between;
}

.otp__sep {
  width: 12px;
  height: 2px;
  border-radius: 2px;
  background: var(--line-2);
  flex: none;
}

.otp__box {
  flex: 1 1 0;
  min-width: 0;
  height: 58px;
  text-align: center;
  font-family: inherit;
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  font-weight: 700;
  color: var(--ink);
  background: #fbfcfe;
  border: 1.5px solid var(--line-2);
  border-radius: var(--r-md);
  caret-color: var(--accent);
  transition:
    border-color 0.16s ease,
    box-shadow 0.16s ease,
    background 0.16s ease,
    transform 0.08s ease;
}

.otp__box:hover {
  border-color: var(--accent);
}

.otp__box:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(59, 110, 246, 0.16);
}

.otp__box.is-filled {
  background: #fff;
  border-color: rgba(59, 110, 246, 0.55);
}

.otp__box.is-mask {
  font-family: "Inter", sans-serif;
  font-size: 30px;
}

/* error state */
.otp.is-error .otp__box {
  border-color: var(--danger);
  background: #fff6f5;
  animation: shake 0.42s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

.otp.is-error .otp__box:focus {
  box-shadow: 0 0 0 4px rgba(212, 73, 62, 0.16);
}

/* success state */
.otp.is-success .otp__box {
  border-color: var(--ok);
  background: #f1fbf5;
  color: var(--ok);
}

@keyframes shake {
  10%,
  90% {
    transform: translateX(-1px);
  }
  20%,
  80% {
    transform: translateX(2px);
  }
  30%,
  50%,
  70% {
    transform: translateX(-4px);
  }
  40%,
  60% {
    transform: translateX(4px);
  }
}

.otp__status {
  min-height: 18px;
  margin: 12px 2px 0;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.otp__status.is-error {
  color: var(--danger);
}

.otp__status.is-success {
  color: var(--ok);
}

/* ---------- row / toggle / resend ---------- */
.row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 18px 0;
}

.row--between {
  justify-content: space-between;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  user-select: none;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-2);
}

.toggle input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.toggle__track {
  position: relative;
  width: 38px;
  height: 22px;
  border-radius: 999px;
  background: var(--line-2);
  transition: background 0.18s ease;
  flex: none;
}

.toggle__dot {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--sh-1);
  transition: transform 0.18s ease;
}

.toggle input:checked + .toggle__track {
  background: var(--accent);
}

.toggle input:checked + .toggle__track .toggle__dot {
  transform: translateX(16px);
}

.toggle input:focus-visible + .toggle__track {
  box-shadow: 0 0 0 3px rgba(59, 110, 246, 0.3);
}

.resend {
  appearance: none;
  border: 0;
  background: transparent;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  cursor: not-allowed;
  padding: 6px 4px;
  border-radius: var(--r-sm);
}

.resend:not(:disabled) {
  color: var(--accent-d);
  cursor: pointer;
}

.resend:not(:disabled):hover {
  text-decoration: underline;
}

.resend:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- buttons ---------- */
.btn {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  border: 0;
  border-radius: var(--r-md);
  padding: 14px 18px;
  cursor: pointer;
  transition:
    transform 0.08s ease,
    box-shadow 0.18s ease,
    background 0.18s ease,
    opacity 0.18s ease;
}

.btn--primary {
  color: #fff;
  background: linear-gradient(180deg, var(--accent), var(--accent-d));
  box-shadow: 0 8px 20px rgba(43, 85, 204, 0.32);
}

.btn--primary:hover {
  box-shadow: 0 12px 26px rgba(43, 85, 204, 0.4);
}

.btn--primary:active {
  transform: translateY(1px) scale(0.995);
}

.btn:focus-visible {
  outline: 2px solid var(--accent-d);
  outline-offset: 2px;
}

.btn.is-loading {
  pointer-events: none;
  opacity: 0.9;
}

.btn.is-loading .btn__label {
  opacity: 0.65;
}

.btn__spin {
  display: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #fff;
  animation: spin 0.7s linear infinite;
}

.btn.is-loading .btn__spin {
  display: inline-block;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.btn--primary.is-done {
  background: linear-gradient(180deg, #25b06f, var(--ok));
  box-shadow: 0 8px 20px rgba(31, 157, 98, 0.32);
}

/* ---------- hint / footer ---------- */
.hint {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 18px 0 0;
  font-size: 12.5px;
  color: var(--muted);
  background: #f7f9fd;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 11px 13px;
}

.hint svg {
  flex: none;
  margin-top: 1px;
  color: var(--accent);
}

.hint strong {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.card__foot {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 14px 26px;
  font-size: 12.5px;
  color: var(--muted);
  background: #fafbfe;
  border-top: 1px solid var(--line);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}

.dot--ok {
  background: var(--ok);
  box-shadow: 0 0 0 3px rgba(31, 157, 98, 0.18);
}

/* ---------- toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translate(-50%, 24px);
  background: var(--navy);
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  padding: 12px 18px;
  border-radius: 999px;
  box-shadow: var(--sh-3);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.22s ease,
    transform 0.22s ease;
  z-index: 50;
  max-width: 90vw;
}

.toast.is-show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.toast.is-error {
  background: var(--danger);
}

.toast.is-success {
  background: var(--ok);
}

/* ---------- responsive ---------- */
@media (max-width: 520px) {
  .page {
    padding: 18px 12px;
  }

  .card__body {
    padding: 22px 18px 18px;
  }

  .card__head,
  .card__foot {
    padding-left: 18px;
    padding-right: 18px;
  }

  .otp__boxes {
    gap: 7px;
  }

  .otp__box {
    height: 52px;
    font-size: 21px;
    border-radius: 11px;
  }

  .otp__sep {
    width: 7px;
  }

  .title {
    font-size: 20px;
  }
}

@media (max-width: 360px) {
  .otp__sep {
    display: none;
  }
}

(function () {
  "use strict";

  var VALID_CODE = "481902";
  var RESEND_SECONDS = 30;

  var form = document.getElementById("otp-form");
  var boxesWrap = document.getElementById("otp-boxes");
  var boxes = Array.prototype.slice.call(
    boxesWrap.querySelectorAll(".otp__box")
  );
  var fieldset = boxesWrap.closest(".otp");
  var status = document.getElementById("otp-status");
  var maskToggle = document.getElementById("mask-toggle");
  var verifyBtn = document.getElementById("verify-btn");
  var resendBtn = document.getElementById("resend-btn");
  var resendText = document.getElementById("resend-text");
  var resendCount = document.getElementById("resend-count");
  var toastEl = document.getElementById("toast");

  var masked = false;
  var locked = false;
  var toastTimer;
  var resendTimer;

  /* ---------- toast helper ---------- */
  function toast(msg, kind) {
    toastEl.textContent = msg;
    toastEl.className = "toast is-show" + (kind ? " is-" + kind : "");
    clearTimeout(toastTimer);
    toastTimer = setTimeout(function () {
      toastEl.className = "toast";
    }, 2600);
  }

  /* ---------- digits / display ---------- */
  function getCode() {
    return boxes
      .map(function (b) {
        return b.dataset.value || "";
      })
      .join("");
  }

  function render(box) {
    var v = box.dataset.value || "";
    box.value = v ? (masked && v ? "•" : v) : "";
    box.classList.toggle("is-filled", !!v);
    box.classList.toggle("is-mask", masked && !!v);
  }

  function renderAll() {
    boxes.forEach(render);
  }

  function setDigit(box, digit) {
    box.dataset.value = digit || "";
    render(box);
  }

  function clearStates() {
    fieldset.classList.remove("is-error", "is-success");
    status.className = "otp__status";
    status.textContent = "";
  }

  function focusBox(i) {
    if (i >= 0 && i < boxes.length) {
      boxes[i].focus();
      boxes[i].select();
    }
  }

  function firstEmptyIndex() {
    for (var i = 0; i < boxes.length; i++) {
      if (!boxes[i].dataset.value) return i;
    }
    return boxes.length - 1;
  }

  /* ---------- input handling ---------- */
  boxes.forEach(function (box, i) {
    box.addEventListener("input", function () {
      if (locked) {
        render(box);
        return;
      }
      clearStates();
      var raw = box.value.replace(/\D/g, "");
      if (!raw) {
        setDigit(box, "");
        return;
      }
      // take last typed digit (handles overwrite)
      var digit = raw.slice(-1);
      setDigit(box, digit);
      if (i < boxes.length - 1) focusBox(i + 1);
      maybeAutoSubmit();
    });

    box.addEventListener("keydown", function (e) {
      if (locked) {
        e.preventDefault();
        return;
      }
      if (e.key === "Backspace") {
        if (box.dataset.value) {
          setDigit(box, "");
        } else if (i > 0) {
          setDigit(boxes[i - 1], "");
          focusBox(i - 1);
        }
        e.preventDefault();
        clearStates();
      } else if (e.key === "ArrowLeft") {
        e.preventDefault();
        focusBox(i - 1);
      } else if (e.key === "ArrowRight") {
        e.preventDefault();
        focusBox(i + 1);
      }
    });

    box.addEventListener("focus", function () {
      box.select();
    });
  });

  /* ---------- paste support ---------- */
  boxesWrap.addEventListener("paste", function (e) {
    if (locked) return;
    e.preventDefault();
    var text = (e.clipboardData || window.clipboardData).getData("text") || "";
    var digits = text.replace(/\D/g, "").slice(0, boxes.length);
    if (!digits) return;
    clearStates();
    boxes.forEach(function (b, idx) {
      setDigit(b, digits[idx] || "");
    });
    var next = digits.length >= boxes.length ? boxes.length - 1 : digits.length;
    focusBox(next);
    toast("Code pasted from clipboard", "");
    maybeAutoSubmit();
  });

  function maybeAutoSubmit() {
    if (getCode().length === boxes.length) {
      // tiny delay so the last digit renders before validating
      setTimeout(function () {
        if (getCode().length === boxes.length && !locked) verify();
      }, 120);
    }
  }

  /* ---------- mask toggle ---------- */
  maskToggle.addEventListener("change", function () {
    masked = maskToggle.checked;
    renderAll();
  });

  /* ---------- verify ---------- */
  function verify() {
    var code = getCode();
    if (code.length < boxes.length) {
      fieldset.classList.add("is-error");
      status.className = "otp__status is-error";
      status.textContent = "Please enter all 6 digits.";
      focusBox(firstEmptyIndex());
      return;
    }

    verifyBtn.classList.add("is-loading");
    locked = true;

    setTimeout(function () {
      verifyBtn.classList.remove("is-loading");
      if (code === VALID_CODE) {
        fieldset.classList.add("is-success");
        status.className = "otp__status is-success";
        status.textContent = "Verified — your transfer is confirmed.";
        verifyBtn.classList.add("is-done");
        verifyBtn.querySelector(".btn__label").textContent = "Verified";
        toast("Identity verified successfully", "success");
        stopResend();
        resendBtn.disabled = true;
        resendText.textContent = "Verified";
      } else {
        locked = false;
        fieldset.classList.add("is-error");
        status.className = "otp__status is-error";
        status.textContent = "That code isn't right. Check and try again.";
        toast("Incorrect verification code", "error");
        // clear and refocus
        boxes.forEach(function (b) {
          setDigit(b, "");
        });
        focusBox(0);
      }
    }, 850);
  }

  form.addEventListener("submit", function (e) {
    e.preventDefault();
    if (!locked) verify();
  });

  /* ---------- resend countdown ---------- */
  function startResend() {
    var remaining = RESEND_SECONDS;
    resendBtn.disabled = true;
    resendCount.textContent = remaining;
    resendText.innerHTML =
      'Resend in <span id="resend-count">' + remaining + "</span>s";
    resendTimer = setInterval(function () {
      remaining -= 1;
      if (remaining <= 0) {
        stopResend();
        resendBtn.disabled = false;
        resendText.textContent = "Resend code";
        return;
      }
      var c = document.getElementById("resend-count");
      if (c) c.textContent = remaining;
    }, 1000);
  }

  function stopResend() {
    clearInterval(resendTimer);
  }

  resendBtn.addEventListener("click", function () {
    if (resendBtn.disabled || locked) return;
    boxes.forEach(function (b) {
      setDigit(b, "");
    });
    clearStates();
    focusBox(0);
    toast("A new code was sent to •••• 4291", "success");
    startResend();
  });

  /* ---------- init ---------- */
  renderAll();
  startResend();
  focusBox(0);
})();

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Banking — OTP / 2FA Input</title>
    <link rel="preconnect" href="https://fonts.googleapis.com" />
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
    <link
      href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap"
      rel="stylesheet"
    />
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <main class="page">
      <section class="card" aria-labelledby="otp-title">
        <header class="card__head">
          <div class="brand">
            <span class="brand__mark" aria-hidden="true">
              <svg viewBox="0 0 24 24" width="20" height="20" fill="none">
                <path
                  d="M12 2 4 6v5c0 4.7 3.2 8.8 8 10 4.8-1.2 8-5.3 8-10V6l-8-4Z"
                  fill="currentColor"
                  opacity=".18"
                />
                <path
                  d="M12 2 4 6v5c0 4.7 3.2 8.8 8 10 4.8-1.2 8-5.3 8-10V6l-8-4Z"
                  stroke="currentColor"
                  stroke-width="1.5"
                  stroke-linejoin="round"
                />
                <path
                  d="m8.5 12 2.4 2.4 4.6-4.8"
                  stroke="currentColor"
                  stroke-width="1.8"
                  stroke-linecap="round"
                  stroke-linejoin="round"
                />
              </svg>
            </span>
            <span class="brand__name">Northvale&nbsp;Bank</span>
          </div>
          <span class="pill pill--secure">
            <svg viewBox="0 0 24 24" width="13" height="13" aria-hidden="true">
              <path
                d="M7 10V8a5 5 0 0 1 10 0v2m-9 0h8a2 2 0 0 1 2 2v6a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2v-6a2 2 0 0 1 2-2Z"
                fill="none"
                stroke="currentColor"
                stroke-width="1.6"
                stroke-linecap="round"
                stroke-linejoin="round"
              />
            </svg>
            Encrypted
          </span>
        </header>

        <div class="card__body">
          <span class="step" aria-hidden="true">Step 2 of 2 · Verify</span>
          <h1 id="otp-title" class="title">Enter your security code</h1>
          <p class="lede">
            We sent a 6-digit verification code to your registered device
            <strong>(•••• 4291)</strong>. The code expires shortly — enter it to
            confirm the transfer.
          </p>

          <form id="otp-form" novalidate>
            <fieldset class="otp" aria-describedby="otp-help otp-status">
              <legend class="sr-only">6-digit one-time passcode</legend>
              <div
                class="otp__boxes"
                id="otp-boxes"
                role="group"
                aria-label="One-time passcode, 6 digits"
              >
                <input
                  class="otp__box"
                  inputmode="numeric"
                  autocomplete="one-time-code"
                  maxlength="1"
                  aria-label="Digit 1"
                  data-index="0"
                />
                <input
                  class="otp__box"
                  inputmode="numeric"
                  maxlength="1"
                  aria-label="Digit 2"
                  data-index="1"
                />
                <input
                  class="otp__box"
                  inputmode="numeric"
                  maxlength="1"
                  aria-label="Digit 3"
                  data-index="2"
                />
                <span class="otp__sep" aria-hidden="true"></span>
                <input
                  class="otp__box"
                  inputmode="numeric"
                  maxlength="1"
                  aria-label="Digit 4"
                  data-index="3"
                />
                <input
                  class="otp__box"
                  inputmode="numeric"
                  maxlength="1"
                  aria-label="Digit 5"
                  data-index="4"
                />
                <input
                  class="otp__box"
                  inputmode="numeric"
                  maxlength="1"
                  aria-label="Digit 6"
                  data-index="5"
                />
              </div>

              <p id="otp-status" class="otp__status" role="status" aria-live="polite"></p>
            </fieldset>

            <div class="row row--between">
              <label class="toggle">
                <input type="checkbox" id="mask-toggle" />
                <span class="toggle__track" aria-hidden="true"
                  ><span class="toggle__dot"></span
                ></span>
                <span class="toggle__label">Mask digits</span>
              </label>

              <button type="button" class="resend" id="resend-btn" disabled>
                <span id="resend-text">Resend in <span id="resend-count">30</span>s</span>
              </button>
            </div>

            <button type="submit" class="btn btn--primary" id="verify-btn">
              <span class="btn__label">Verify &amp; continue</span>
              <span class="btn__spin" aria-hidden="true"></span>
            </button>

            <p id="otp-help" class="hint">
              <svg viewBox="0 0 24 24" width="14" height="14" aria-hidden="true">
                <circle cx="12" cy="12" r="9" fill="none" stroke="currentColor" stroke-width="1.6" />
                <path d="M12 11v5M12 8h.01" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" />
              </svg>
              Demo code is <strong>481902</strong>. Never share a real code with anyone — not even Northvale staff.
            </p>
          </form>
        </div>

        <footer class="card__foot">
          <span class="dot dot--ok" aria-hidden="true"></span>
          Two-factor authentication keeps your account secure.
        </footer>
      </section>
    </main>

    <div id="toast" class="toast" role="alert" aria-live="assertive"></div>

    <script src="script.js"></script>
  </body>
</html>

OTP / 2FA Input

A focused verification screen for confirming a sensitive banking action, styled with a calm navy-and-trust-blue palette. Six single-character boxes form the one-time passcode field: typing a digit advances the caret to the next box, Backspace steps backward and clears, and the arrow keys move between positions. Pasting a code from an SMS or authenticator app fills every box at once and triggers validation automatically.

A “Mask digits” toggle swaps the entered characters for dots so the code can’t be read over your shoulder, and a resend control stays disabled behind a 30-second countdown to discourage rapid retries. When you submit, the screen shows a brief loading state, then resolves into either a red error state — with a shake animation and a cleared field — or a green verified state confirming the transfer.

Everything runs on vanilla JavaScript with a small toast() helper, accessible aria-live status messaging, tabular figures for the code, WCAG-AA contrast, and a responsive layout tuned for narrow mobile screens. The demo code is 481902.

Illustrative UI only — not real banking software or financial advice.