UI Components Medium

Sidebar Admin

Collapsible admin sidebar with icon-only mode, grouped navigation sections, active state, and mobile overlay. No dependencies.

Open in Lab

css vanilla-js

Targets: JS HTML

Code

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --sidebar-w: 260px;
  --sidebar-w-collapsed: 64px;
  --bg: #0f1117;
  --surface: #16181f;
  --surface2: #1e2130;
  --border: #2a2d3a;
  --text: #e2e8f0;
  --text-muted: #64748b;
  --accent: #818cf8;
  --accent-bg: rgba(129, 140, 248, 0.12);
  --green: #34d399;
  --red: #f87171;
  --transition: 260ms cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── Overlay (mobile) ── */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 40;
}
.overlay.visible {
  display: block;
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: width var(--transition);
  overflow: hidden;
  position: relative;
  flex-shrink: 0;
  z-index: 50;
}

.sidebar.collapsed {
  width: var(--sidebar-w-collapsed);
}

/* Logo */
.s-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  white-space: nowrap;
}
.s-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-bg);
  border-radius: 10px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.s-logo-text {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  opacity: 1;
  transition: opacity var(--transition);
}
.sidebar.collapsed .s-logo-text {
  opacity: 0;
  pointer-events: none;
}

/* Collapse button */
.s-collapse-btn {
  position: absolute;
  top: 20px;
  right: 10px;
  width: 24px;
  height: 24px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface2);
  color: var(--text-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background .2s, color .2s;
  z-index: 2;
}
.s-collapse-btn:hover {
  background: var(--accent-bg);
  color: var(--accent);
}
.sidebar.collapsed .s-collapse-btn svg {
  transform: rotate(180deg);
}
.s-collapse-btn svg {
  transition: transform var(--transition);
}

/* Nav */
.s-nav {
  flex: 1;
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}

.s-section-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  padding: 8px 6px 4px;
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--transition), height var(--transition);
}
.sidebar.collapsed .s-section-label {
  opacity: 0;
  height: 0;
  padding: 0;
}

.s-divider {
  height: 1px;
  background: var(--border);
  margin: 8px 0;
}

.s-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  transition: background .15s, color .15s;
  position: relative;
}
.s-item:hover {
  background: var(--surface2);
  color: var(--text);
}
.s-item.active {
  background: var(--accent-bg);
  color: var(--accent);
}
.s-item.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
}

.s-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
}
.s-label {
  flex: 1;
  opacity: 1;
  transition: opacity var(--transition);
}
.sidebar.collapsed .s-label {
  opacity: 0;
}

.s-badge {
  font-size: 0.65rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  padding: 1px 6px;
  border-radius: 999px;
  line-height: 1.5;
  transition: opacity var(--transition);
}
.s-badge--dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  padding: 0;
}
.sidebar.collapsed .s-badge {
  opacity: 0;
}

/* Tooltip in collapsed mode */
.sidebar.collapsed .s-item::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s;
  z-index: 100;
}
.sidebar.collapsed .s-item:hover::after {
  opacity: 1;
}

/* User */
.s-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 12px;
  border-top: 1px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s;
}
.s-user:hover {
  background: var(--surface2);
}
.s-user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #a5b4fc);
  display: grid;
  place-items: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.s-user-info {
  display: flex;
  flex-direction: column;
  opacity: 1;
  transition: opacity var(--transition);
}
.sidebar.collapsed .s-user-info {
  opacity: 0;
}
.s-user-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}
.s-user-role {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 1px;
}

/* Tooltip for user */
.sidebar.collapsed .s-user::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 12px);
  bottom: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s;
  z-index: 100;
}
.sidebar.collapsed .s-user:hover::after {
  opacity: 1;
}

/* ── Main area ── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Topbar */
.topbar {
  height: 60px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 12px;
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: background .15s;
}
.hamburger:hover span {
  background: var(--text);
}

.topbar-title {
  font-size: 1rem;
  font-weight: 600;
  flex: 1;
}
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.topbar-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  position: relative;
  transition: background .15s, color .15s;
}
.topbar-icon-btn:hover {
  color: var(--text);
  background: var(--border);
}
.topbar-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 16px;
  height: 16px;
  background: var(--red);
  border-radius: 50%;
  font-size: 0.6rem;
  font-weight: 700;
  color: #fff;
  display: grid;
  place-items: center;
}
.topbar-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #a5b4fc);
  display: grid;
  place-items: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
}

/* Content */
.content {
  flex: 1;
  overflow-y: auto;
  padding: 28px 24px;
}
.content-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.content-subtitle {
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: 0.875rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  transition: border-color .2s;
}
.stat-card:hover {
  border-color: var(--accent);
}
.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}
.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.stat-delta {
  font-size: 0.78rem;
  font-weight: 600;
}
.stat-delta.up {
  color: var(--green);
}
.stat-delta.down {
  color: var(--red);
}

/* ── Mobile ── */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform var(--transition), width var(--transition);
    width: var(--sidebar-w) !important;
  }
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  .s-collapse-btn {
    display: none;
  }
  .hamburger {
    display: flex;
  }
}

const sidebar = document.getElementById("sidebar");
const collapseBtn = document.getElementById("collapseBtn");
const hamburger = document.getElementById("hamburger");
const overlay = document.getElementById("overlay");

// Desktop collapse toggle
collapseBtn?.addEventListener("click", () => {
  sidebar.classList.toggle("collapsed");
  const isCollapsed = sidebar.classList.contains("collapsed");
  collapseBtn.setAttribute("aria-expanded", String(!isCollapsed));
});

// Mobile open
hamburger?.addEventListener("click", () => {
  sidebar.classList.add("mobile-open");
  overlay.classList.add("visible");
});

// Mobile close
function closeMobile() {
  sidebar.classList.remove("mobile-open");
  overlay.classList.remove("visible");
}
overlay?.addEventListener("click", closeMobile);
document.addEventListener("keydown", (e) => {
  if (e.key === "Escape") closeMobile();
});

// Active nav item
document.querySelectorAll(".s-item").forEach((item) => {
  item.addEventListener("click", (e) => {
    e.preventDefault();
    document.querySelectorAll(".s-item").forEach((i) => {
      i.classList.remove("active");
      i.removeAttribute("aria-current");
    });
    item.classList.add("active");
    item.setAttribute("aria-current", "page");
    // Update topbar title
    const label = item.querySelector(".s-label")?.textContent?.trim();
    const title = document.querySelector(".topbar-title");
    if (label && title) title.textContent = label;
    // Close mobile
    closeMobile();
  });
});

// Persist collapse state
const savedCollapsed = localStorage.getItem("sidebar-collapsed") === "true";
if (savedCollapsed) {
  sidebar.classList.add("collapsed");
  collapseBtn?.setAttribute("aria-expanded", "false");
}
collapseBtn?.addEventListener("click", () => {
  localStorage.setItem("sidebar-collapsed", sidebar.classList.contains("collapsed").toString());
});

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Sidebar Admin</title>
  <link rel="stylesheet" href="style.css" />
</head>
<body>

  <!-- Mobile overlay -->
  <div class="overlay" id="overlay"></div>

  <!-- ── Sidebar ── -->
  <aside class="sidebar" id="sidebar">

    <!-- Logo -->
    <div class="s-logo">
      <div class="s-logo-icon">
        <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="#818cf8" stroke-width="2.5">
          <polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2"/>
        </svg>
      </div>
      <span class="s-logo-text">StealthAdmin</span>
    </div>

    <!-- Collapse toggle -->
    <button class="s-collapse-btn" id="collapseBtn" aria-label="Toggle sidebar" aria-expanded="true">
      <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5">
        <path d="m15 18-6-6 6-6"/>
      </svg>
    </button>

    <!-- Navigation -->
    <nav class="s-nav" aria-label="Admin navigation">

      <div class="s-section-label">Main</div>

      <a href="#" class="s-item active" aria-current="page" data-tooltip="Dashboard">
        <span class="s-icon">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <rect x="3" y="3" width="7" height="7" rx="1"/><rect x="14" y="3" width="7" height="7" rx="1"/>
            <rect x="3" y="14" width="7" height="7" rx="1"/><rect x="14" y="14" width="7" height="7" rx="1"/>
          </svg>
        </span>
        <span class="s-label">Dashboard</span>
      </a>

      <a href="#" class="s-item" data-tooltip="Analytics">
        <span class="s-icon">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <line x1="18" y1="20" x2="18" y2="10"/><line x1="12" y1="20" x2="12" y2="4"/>
            <line x1="6" y1="20" x2="6" y2="14"/><line x1="2" y1="20" x2="22" y2="20"/>
          </svg>
        </span>
        <span class="s-label">Analytics</span>
        <span class="s-badge">12</span>
      </a>

      <a href="#" class="s-item" data-tooltip="Users">
        <span class="s-icon">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/>
            <circle cx="9" cy="7" r="4"/>
            <path d="M23 21v-2a4 4 0 0 0-3-3.87M16 3.13a4 4 0 0 1 0 7.75"/>
          </svg>
        </span>
        <span class="s-label">Users</span>
      </a>

      <a href="#" class="s-item" data-tooltip="Orders">
        <span class="s-icon">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <path d="M6 2 3 6v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2V6l-3-4z"/>
            <line x1="3" y1="6" x2="21" y2="6"/>
            <path d="M16 10a4 4 0 0 1-8 0"/>
          </svg>
        </span>
        <span class="s-label">Orders</span>
      </a>

      <a href="#" class="s-item" data-tooltip="Products">
        <span class="s-icon">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <path d="M21 16V8a2 2 0 0 0-1-1.73l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.73l7 4a2 2 0 0 0 2 0l7-4A2 2 0 0 0 21 16z"/>
          </svg>
        </span>
        <span class="s-label">Products</span>
      </a>

      <div class="s-divider"></div>
      <div class="s-section-label">System</div>

      <a href="#" class="s-item" data-tooltip="Messages">
        <span class="s-icon">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/>
          </svg>
        </span>
        <span class="s-label">Messages</span>
        <span class="s-badge s-badge--dot"></span>
      </a>

      <a href="#" class="s-item" data-tooltip="Settings">
        <span class="s-icon">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <circle cx="12" cy="12" r="3"/>
            <path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83-2.83l.06-.06A1.65 1.65 0 0 0 4.68 15a1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 2.83-2.83l.06.06A1.65 1.65 0 0 0 9 4.68a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 2.83l-.06.06A1.65 1.65 0 0 0 19.4 9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z"/>
          </svg>
        </span>
        <span class="s-label">Settings</span>
      </a>

    </nav>

    <!-- User profile -->
    <div class="s-user" data-tooltip="Alex Chen">
      <div class="s-user-avatar">AC</div>
      <div class="s-user-info">
        <span class="s-user-name">Alex Chen</span>
        <span class="s-user-role">Admin</span>
      </div>
    </div>

  </aside>

  <!-- ── Main content ── -->
  <div class="main" id="main">

    <!-- Top bar -->
    <header class="topbar">
      <button class="hamburger" id="hamburger" aria-label="Open menu">
        <span></span><span></span><span></span>
      </button>
      <h1 class="topbar-title">Dashboard</h1>
      <div class="topbar-actions">
        <button class="topbar-icon-btn" title="Search">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <circle cx="11" cy="11" r="8"/><line x1="21" y1="21" x2="16.65" y2="16.65"/>
          </svg>
        </button>
        <button class="topbar-icon-btn" title="Notifications">
          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
            <path d="M18 8A6 6 0 0 0 6 8c0 7-3 9-3 9h18s-3-2-3-9"/>
            <path d="M13.73 21a2 2 0 0 1-3.46 0"/>
          </svg>
          <span class="topbar-badge">3</span>
        </button>
        <div class="topbar-avatar">AC</div>
      </div>
    </header>

    <!-- Content -->
    <main class="content">
      <h2 class="content-title">Good morning, Alex 👋</h2>
      <p class="content-subtitle">Here's what's happening today.</p>

      <div class="stat-grid">
        <div class="stat-card">
          <div class="stat-label">Total Users</div>
          <div class="stat-value">24,521</div>
          <div class="stat-delta up">+12.5%</div>
        </div>
        <div class="stat-card">
          <div class="stat-label">Revenue</div>
          <div class="stat-value">$84,320</div>
          <div class="stat-delta up">+8.2%</div>
        </div>
        <div class="stat-card">
          <div class="stat-label">Orders</div>
          <div class="stat-value">1,284</div>
          <div class="stat-delta down">-3.1%</div>
        </div>
        <div class="stat-card">
          <div class="stat-label">Uptime</div>
          <div class="stat-value">99.98%</div>
          <div class="stat-delta up">+0.01%</div>
        </div>
      </div>
    </main>
  </div>

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

A production-ready collapsible admin sidebar with icon-only compact mode, grouped navigation sections, tooltips in icon mode, mobile overlay, and smooth transitions.

Features

Collapses to icon-only strip (260px → 64px) with CSS transitions
Tooltip labels appear on hover in collapsed mode
Grouped sections with dividers and labels
Active item highlighting with left-accent indicator
Mobile: hidden off-screen, hamburger button slides it in with overlay backdrop
Bottom user profile block with avatar and role

How it works

Toggle button sets .collapsed class on <aside> — CSS handles width and label visibility
In collapsed mode, [data-tooltip] attribute + CSS ::after pseudo-element shows labels on hover
Mobile breakpoint (≤768px) switches to overlay mode — sidebar uses transform: translateX
Overlay backdrop click closes the sidebar

Accessibility

<nav> landmark with aria-label
Collapse button has aria-expanded and aria-label
Active item uses aria-current="page"