Terminal / CLI

Monochrome command-line aesthetic with green phosphor text, blinking cursors, and raw functional beauty.

html css javascript

Targets: JS HTML

Code

/* ============================================================
   TERMINAL / CLI — Style Showcase
   Font: Courier New / Lucida Console / monospace only
   Palette: #33FF33 (phosphor green) on #0A0F0A (near-black)
   ============================================================ */

/* --- Root variables --- */
:root {
  --green: #33ff33;
  --green-dim: #1a8c1a;
  --green-mute: rgba(51, 255, 51, 0.4);
  --green-faint: rgba(51, 255, 51, 0.12);
  --warn: #ffd700;
  --error: #ff3333;
  --bg: #0a0f0a;
  --panel: #0d150d;
  --border: rgba(51, 255, 51, 0.35);
  --font: "Courier New", "Lucida Console", Courier, monospace;
}

/* --- Reset & base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

body {
  background: var(--bg);
  color: var(--green);
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle green CRT noise texture via gradient */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 3px,
    rgba(0, 0, 0, 0.08) 4px
  );
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--green-dim);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--green);
}

/* --- Blink animation --- */
@keyframes blink {
  0%,
  49% {
    opacity: 1;
  }
  50%,
  100% {
    opacity: 0;
  }
}

/* --- Header --- */
.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--green);
}

.prompt-sym {
  color: var(--green-dim);
}

.logo-text {
  font-weight: bold;
}

.cursor-blink {
  animation: blink 0.8s step-end infinite;
}

.header-nav {
  display: flex;
  gap: 20px;
}

.nav-link {
  color: var(--green-dim);
  text-decoration: none;
  font-size: 12px;
  transition: color 0.15s;
}

.nav-link:hover,
.nav-active {
  color: var(--green);
}

.nav-active {
  text-decoration: underline;
}

.header-uptime {
  font-size: 11px;
  color: var(--green-dim);
  letter-spacing: 0.05em;
}

/* --- Hero --- */
.hero {
  padding: 32px 20px 16px;
  border-bottom: 1px solid var(--border);
  max-width: 900px;
  margin: 0 auto;
}

.ascii-art {
  font-size: clamp(7px, 1.3vw, 13px);
  color: var(--green);
  line-height: 1.25;
  margin-bottom: 20px;
  overflow-x: auto;
  white-space: pre;
}

.hero-tagline {
  font-size: 12px;
  color: var(--green);
  margin-bottom: 6px;
}

.hero-sub {
  font-size: 11px;
  color: var(--green-dim);
}

/* --- Status bar --- */
.status-bar {
  background: rgba(51, 255, 51, 0.06);
  border-bottom: 1px solid var(--border);
  padding: 6px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  flex-wrap: wrap;
}

.status-item {
  color: var(--green-dim);
}
.status-ok {
  color: var(--green);
}
.status-sep {
  color: var(--border);
  user-select: none;
}

/* --- Main content --- */
.main-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px 20px 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* --- Terminal window --- */
.terminal-window {
  background: var(--panel);
  border: 1px solid var(--border);
}

.term-titlebar {
  background: rgba(51, 255, 51, 0.08);
  border-bottom: 1px solid var(--border);
  padding: 7px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.term-dots {
  display: flex;
  gap: 5px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.dot-red {
  background: #ff5f57;
}
.dot-yellow {
  background: #febc2e;
}
.dot-green {
  background: #28c840;
}

.term-title {
  font-size: 11px;
  color: var(--green-dim);
  flex: 1;
  text-align: center;
  letter-spacing: 0.05em;
}

.term-body {
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Output lines */
.output-line {
  font-size: 12px;
  color: var(--green);
  display: flex;
  gap: 8px;
  align-items: baseline;
}

.output-line.muted {
  color: var(--green-dim);
}

.prompt {
  color: var(--green);
  flex-shrink: 0;
  font-weight: bold;
}

/* --- Profile content --- */
.profile-content {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  padding: 8px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 4px 0;
}

.avatar-art {
  font-size: 11px;
  line-height: 1.3;
  color: var(--green-dim);
  white-space: pre;
}

.profile-data {
  flex: 1;
  min-width: 180px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.data-row {
  font-size: 12px;
}

.data-key {
  color: var(--green-dim);
}

.data-val {
  color: var(--green);
}

.profile-stats {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}

.stat-block {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-num {
  font-size: 15px;
  font-weight: bold;
  color: var(--green);
}

.stat-lbl {
  font-size: 10px;
  color: var(--green-dim);
  letter-spacing: 0.08em;
}

.stat-sep {
  color: var(--border);
  font-size: 18px;
  line-height: 1;
  user-select: none;
}

/* --- Buttons --- */
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.btn {
  font-family: var(--font);
  font-size: 12px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px 16px;
  letter-spacing: 0.04em;
  transition: background 0.1s, color 0.1s;
  outline: none;
}

.btn:focus-visible {
  outline: 1px dashed var(--green);
  outline-offset: 2px;
}

/* Primary — [EXECUTE] */
.btn-primary {
  color: var(--bg);
  background: var(--green);
  border: 1px solid var(--green);
  font-weight: bold;
}

.btn-primary:hover {
  background: #50ff50;
  border-color: #50ff50;
}

.btn-primary:active {
  background: var(--green-dim);
  border-color: var(--green-dim);
  color: var(--bg);
}

/* Secondary — [STATUS] */
.btn-secondary {
  color: rgba(51, 255, 51, 0.7);
  background: transparent;
  border: 1px solid rgba(51, 255, 51, 0.5);
}

.btn-secondary:hover {
  color: var(--green);
  border-color: var(--green);
  background: var(--green-faint);
}

.btn-secondary:active {
  background: rgba(51, 255, 51, 0.2);
}

/* Ghost — text only, looks like a command */
.btn-ghost {
  color: var(--green-dim);
  background: transparent;
  border: none;
  padding-left: 0;
}

.btn-ghost::before {
  content: "$ ";
  color: var(--green);
}

.btn-ghost:hover {
  color: var(--green);
  text-decoration: underline;
}

/* Command output area */
.cmd-output-area {
  font-size: 11px;
  color: var(--green-dim);
  min-height: 0;
  max-height: 120px;
  overflow-y: auto;
  white-space: pre-wrap;
  border-top: 0;
  padding-top: 0;
}

.cmd-output-area:not(:empty) {
  border-top: 1px solid var(--border);
  padding-top: 10px;
  margin-top: 4px;
}

.cmd-output-line {
  display: block;
  padding: 1px 0;
}

.cmd-output-line.cmd-line {
  color: var(--green);
}

.cmd-output-line.out-line {
  color: var(--green-dim);
}

/* --- Input --- */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-label {
  font-size: 11px;
  color: var(--green-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.term-input-wrap {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 8px 12px;
  max-width: 480px;
}

.input-prompt {
  color: var(--green);
  font-weight: bold;
  flex-shrink: 0;
  white-space: pre;
}

.term-input {
  font-family: var(--font);
  font-size: 13px;
  background: transparent;
  color: var(--green);
  border: none;
  outline: none;
  flex: 1;
  caret-color: var(--green);
}

.term-input::placeholder {
  color: var(--green-mute);
}

.term-input-wrap:focus-within {
  border-color: var(--green);
  box-shadow: 0 0 0 1px var(--green-mute);
}

/* --- Badges --- */
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 4px 0;
}

.badge {
  font-family: var(--font);
  font-size: 11px;
  padding: 3px 8px;
  color: var(--green-dim);
  border: 1px solid var(--border);
  background: var(--bg);
  letter-spacing: 0.03em;
}

.badge-on {
  color: var(--green);
  border-color: rgba(51, 255, 51, 0.6);
  background: var(--green-faint);
}

.badge-warn {
  color: var(--warn);
  border-color: rgba(255, 215, 0, 0.4);
  background: rgba(255, 215, 0, 0.06);
}

.badge-off {
  color: var(--error);
  border-color: rgba(255, 51, 51, 0.4);
  background: rgba(255, 51, 51, 0.05);
  text-decoration: line-through;
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero {
    padding: 20px 14px 12px;
  }
  .ascii-art {
    font-size: 6px;
  }
  .btn {
    width: 100%;
  }
  .profile-content {
    flex-direction: column;
  }
}

/* ============================================================
   TERMINAL / CLI — Interactive Script
   - Button click simulates command execution with typed output
   - Input enter key echoes typed command as output
   - Typewriter effect for output lines
   - Header uptime counter (live ticking)
   ============================================================ */

(function () {
  "use strict";

  /* ----------------------------------------------------------
     1. Button click → simulate command execution
     Each button has data-cmd and data-output attributes
  ---------------------------------------------------------- */
  const outputArea = document.getElementById("cmd-output");
  const buttons = document.querySelectorAll(".btn[data-cmd]");

  function appendLine(text, cssClass) {
    if (!outputArea) return;
    const line = document.createElement("span");
    line.className = "cmd-output-line " + (cssClass || "");
    line.textContent = text;
    outputArea.appendChild(line);
    outputArea.scrollTop = outputArea.scrollHeight;
  }

  function typewriterAppend(text, cssClass, delay, callback) {
    if (!outputArea) return;
    const line = document.createElement("span");
    line.className = "cmd-output-line " + (cssClass || "");
    outputArea.appendChild(line);

    let i = 0;
    const interval = setInterval(function () {
      line.textContent += text[i];
      i++;
      outputArea.scrollTop = outputArea.scrollHeight;
      if (i >= text.length) {
        clearInterval(interval);
        if (callback) setTimeout(callback, 80);
      }
    }, delay || 18);
  }

  buttons.forEach(function (btn) {
    btn.addEventListener("click", function () {
      const cmd = btn.dataset.cmd || "";
      const output = btn.dataset.output || "";

      // Flash button
      btn.style.opacity = "0.6";
      setTimeout(function () {
        btn.style.opacity = "";
      }, 120);

      // Show command line
      typewriterAppend("$ " + cmd, "cmd-line", 14, function () {
        // Show each output line
        const lines = output.split("\n");
        let lineIdx = 0;

        function nextLine() {
          if (lineIdx >= lines.length) return;
          const txt = lines[lineIdx];
          lineIdx++;
          appendLine("> " + txt, "out-line");
          if (lineIdx < lines.length) {
            setTimeout(nextLine, 100);
          } else {
            appendLine("> Exit code: 0", "out-line");
          }
        }

        setTimeout(nextLine, 120);
      });
    });
  });

  /* ----------------------------------------------------------
     2. Input enter key: echo typed line as terminal output
  ---------------------------------------------------------- */
  const termInput = document.getElementById("term-input");

  if (termInput && outputArea) {
    termInput.addEventListener("keydown", function (e) {
      if (e.key !== "Enter") return;
      const val = termInput.value.trim();
      if (!val) return;

      appendLine("$ " + val, "cmd-line");

      // Simulate a "command not found" response for unknown commands
      const knownCmds = {
        help: "Usage: terminal-ui [--demo|--verbose|--help]\nAll systems nominal.",
        ls: "profile.sh  actions.sh  input.sh  flags.sh",
        whoami: "root_user",
        pwd: "/usr/local/terminal-ui/demo",
        clear: "__CLEAR__",
        date: new Date().toString(),
        uptime: "up 99 days, 23 hours, 59 minutes",
        version: "terminal-ui v2.1.0",
      };

      const response = knownCmds[val.toLowerCase()];

      setTimeout(function () {
        if (response === "__CLEAR__") {
          outputArea.innerHTML = "";
        } else if (response) {
          response.split("\n").forEach(function (line) {
            appendLine("> " + line, "out-line");
          });
        } else {
          appendLine("> command not found: " + val, "out-line");
          appendLine('> Try "help" for available commands.', "out-line");
        }
        termInput.value = "";
      }, 200);
    });
  }

  /* ----------------------------------------------------------
     3. Live uptime counter in the header
  ---------------------------------------------------------- */
  const uptimeEl = document.querySelector(".header-uptime");
  if (uptimeEl) {
    let seconds = 0;
    setInterval(function () {
      seconds++;
      const h = String(Math.floor(seconds / 3600)).padStart(2, "0");
      const m = String(Math.floor((seconds % 3600) / 60)).padStart(2, "0");
      const s = String(seconds % 60).padStart(2, "0");
      uptimeEl.textContent = "UPTIME: " + h + ":" + m + ":" + s;
    }, 1000);
  }

  /* ----------------------------------------------------------
     4. Badges — toggle active state on click
  ---------------------------------------------------------- */
  const badges = document.querySelectorAll(".badge");
  badges.forEach(function (badge) {
    if (badge.classList.contains("badge-off")) return; // deprecated can't be toggled
    badge.style.cursor = "pointer";

    badge.addEventListener("click", function () {
      if (badge.classList.contains("badge-on")) {
        badge.classList.remove("badge-on");
        badge.style.textDecoration = "line-through";
        badge.style.opacity = "0.5";
      } else {
        badge.classList.add("badge-on");
        badge.style.textDecoration = "";
        badge.style.opacity = "";
      }
    });
  });

  /* ----------------------------------------------------------
     5. Cursor blink speed on input focus
  ---------------------------------------------------------- */
  if (termInput) {
    const cursorInInput = document.querySelector(".cursor-blink");
    termInput.addEventListener("focus", function () {
      if (cursorInInput) cursorInInput.style.animationDuration = "0.4s";
    });
    termInput.addEventListener("blur", function () {
      if (cursorInInput) cursorInInput.style.animationDuration = "0.8s";
    });
  }
})();

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>Terminal / CLI</title>
  </head>
  <body>
    <!-- Header -->
    <header class="site-header">
      <div class="header-inner">
        <div class="header-logo">
          <span class="prompt-sym">$</span>
          <span class="logo-text">terminal-ui<span class="cursor-blink">_</span></span>
        </div>
        <nav class="header-nav">
          <a href="#" class="nav-link">--home</a>
          <a href="#" class="nav-link">--about</a>
          <a href="#" class="nav-link nav-active">--demo</a>
        </nav>
        <div class="header-uptime">UPTIME: 99.9%</div>
      </div>
    </header>

    <!-- Hero / ASCII banner -->
    <section class="hero">
      <pre class="ascii-art" aria-label="Terminal UI ASCII logo">
 ████████╗███████╗██████╗ ███╗   ███╗
    ██╔══╝██╔════╝██╔══██╗████╗ ████║
    ██║   █████╗  ██████╔╝██╔████╔██║
    ██║   ██╔══╝  ██╔══██╗██║╚██╔╝██║
    ██║   ███████╗██║  ██║██║ ╚═╝ ██║
    ╚═╝   ╚══════╝╚═╝  ╚═╝╚═╝     ╚═╝</pre>
      <p class="hero-tagline">&gt; COMMAND-LINE AESTHETICS FOR THE MODERN WEB</p>
      <p class="hero-sub">&gt; Version 2.1.0 — MIT License — Zero Dependencies</p>
    </section>

    <!-- System status bar -->
    <div class="status-bar">
      <span class="status-item status-ok">● SYS: ONLINE</span>
      <span class="status-sep">|</span>
      <span class="status-item">CPU: 4%</span>
      <span class="status-sep">|</span>
      <span class="status-item">MEM: 128MB</span>
      <span class="status-sep">|</span>
      <span class="status-item status-ok">● NET: CONNECTED</span>
    </div>

    <!-- Main content -->
    <main class="main-content">
      <!-- Profile card — terminal window style -->
      <div class="terminal-window">
        <div class="term-titlebar">
          <div class="term-dots">
            <span class="dot dot-red"></span>
            <span class="dot dot-yellow"></span>
            <span class="dot dot-green"></span>
          </div>
          <span class="term-title">profile.sh</span>
        </div>
        <div class="term-body">
          <div class="output-line"><span class="prompt">$</span> cat profile.json</div>
          <div class="output-line muted">&gt; Reading user data...</div>
          <div class="profile-content">
            <div class="profile-avatar">
              <pre class="avatar-art" aria-hidden="true">
  ┌──────────┐
  │  ██████  │
  │ ████████ │
  │  ██  ██  │
  │  ██████  │
  │ /██████\ │
  │/████████\│
  └──────────┘</pre>
            </div>
            <div class="profile-data">
              <div class="data-row"><span class="data-key">"name":</span><span class="data-val"> "root_user"</span></div>
              <div class="data-row"><span class="data-key">"role":</span><span class="data-val"> "System Administrator"</span></div>
              <div class="data-row"><span class="data-key">"shell":</span><span class="data-val"> "/bin/bash"</span></div>
              <div class="data-row"><span class="data-key">"uid":</span><span class="data-val"> 0</span></div>
              <div class="profile-stats">
                <div class="stat-block">
                  <span class="stat-num">1,337</span>
                  <span class="stat-lbl">COMMITS</span>
                </div>
                <span class="stat-sep">│</span>
                <div class="stat-block">
                  <span class="stat-num">42</span>
                  <span class="stat-lbl">REPOS</span>
                </div>
                <span class="stat-sep">│</span>
                <div class="stat-block">
                  <span class="stat-num">99%</span>
                  <span class="stat-lbl">UPTIME</span>
                </div>
              </div>
            </div>
          </div>
          <div class="output-line muted">&gt; Done. Exit code: 0</div>
        </div>
      </div>

      <!-- Buttons card -->
      <div class="terminal-window">
        <div class="term-titlebar">
          <div class="term-dots">
            <span class="dot dot-red"></span>
            <span class="dot dot-yellow"></span>
            <span class="dot dot-green"></span>
          </div>
          <span class="term-title">actions.sh</span>
        </div>
        <div class="term-body">
          <div class="output-line"><span class="prompt">$</span> ls --commands</div>
          <div class="button-row">
            <button class="btn btn-primary" data-cmd="deploy --env=production" data-output="Deploying to production... Done. Build ID: a3f91c2">
              [EXECUTE]
            </button>
            <button class="btn btn-secondary" data-cmd="status --verbose" data-output="All systems nominal. 3 services running.">
              [STATUS]
            </button>
            <button class="btn btn-ghost" data-cmd="help" data-output="Usage: terminal-ui [options]&#10;  --demo    Run demo mode&#10;  --verbose Enable verbose output">
              help
            </button>
          </div>
          <div class="cmd-output-area" id="cmd-output" aria-live="polite"></div>
        </div>
      </div>

      <!-- Input card -->
      <div class="terminal-window">
        <div class="term-titlebar">
          <div class="term-dots">
            <span class="dot dot-red"></span>
            <span class="dot dot-yellow"></span>
            <span class="dot dot-green"></span>
          </div>
          <span class="term-title">input.sh</span>
        </div>
        <div class="term-body">
          <div class="output-line"><span class="prompt">$</span> read --prompt "ENTER COMMAND"</div>
          <div class="input-group">
            <label class="input-label" for="term-input">&gt; INPUT</label>
            <div class="term-input-wrap">
              <span class="input-prompt">$ </span>
              <input
                id="term-input"
                class="term-input"
                type="text"
                placeholder="type your command..."
                autocomplete="off"
                spellcheck="false"
              />
            </div>
          </div>
        </div>
      </div>

      <!-- Badges card -->
      <div class="terminal-window">
        <div class="term-titlebar">
          <div class="term-dots">
            <span class="dot dot-red"></span>
            <span class="dot dot-yellow"></span>
            <span class="dot dot-green"></span>
          </div>
          <span class="term-title">flags.sh</span>
        </div>
        <div class="term-body">
          <div class="output-line"><span class="prompt">$</span> status --list-flags</div>
          <div class="output-line muted">&gt; Active flags:</div>
          <div class="badge-row">
            <span class="badge badge-on">--active</span>
            <span class="badge badge-on">--online</span>
            <span class="badge">--v2.1</span>
            <span class="badge">--stable</span>
            <span class="badge badge-warn">--debug</span>
            <span class="badge badge-off">--deprecated</span>
          </div>
        </div>
      </div>
    </main>

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

Terminal / CLI

The terminal aesthetic strips design down to its mathematical skeleton: monospace type, right-angle geometry, phosphor green on near-black, and the blinking cursor as the sole animation. Every element is a command, every label is a prompt, and every section looks like output from a well-tuned shell session.

Cards become terminal windows — complete with a mock title bar showing a filename in brackets — while buttons read like shell commands wrapped in square brackets. Badge labels adopt the double-dash flag syntax (--active, --online) familiar to anyone who has spent time in a CLI. The result is something that communicates precision, authority, and trust through the radical reduction of visual noise.

Key characteristics

Background #0A0F0A (near-black with green undertone), text #33FF33 (classic phosphor)
Exclusively Courier New / Lucida Console / monospace — no decorative fonts anywhere
Zero border-radius — every corner is a right angle
Terminal window chrome: thin title bar with [filename.sh] label and status dot indicators
Content prefixed with $ prompts and > output markers throughout
Blinking cursor animation via @keyframes blink at 0.8s step-end
JS: button click simulates command execution by appending typed output lines

When to use it

Use this style for developer tools, API documentation sites, CLI app landing pages, security/hacking-themed projects, code portfolio pieces, or any context where the audience is technical and minimalism signals competence. Pairs well with monospace headings and ASCII art section dividers.