Announcement Banner — StealThis.dev

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f9fafb;
  color: #111;
}

/* Announcement banner */
.announcement-banner {
  background: #6366f1;
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  overflow: hidden;
  max-height: 80px;
}

.announcement-banner.dismissed {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
}

.announcement-banner--warning {
  background: #d97706;
}
.announcement-banner--error {
  background: #dc2626;
}
.announcement-banner--dark {
  background: #111827;
}

.announcement-banner--static {
  position: static;
  border-radius: 10px;
  margin-bottom: 12px;
}

.banner-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  max-width: 1080px;
  margin: 0 auto;
}

.banner-icon {
  font-size: 16px;
  flex-shrink: 0;
}

.banner-text {
  flex: 1;
  font-size: 14px;
  line-height: 1.5;
}

.banner-link {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-weight: 600;
  margin-left: 4px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
  transition: border-color 0.15s;
}
.banner-link:hover {
  border-color: #fff;
}

.banner-close {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: color 0.15s, background 0.15s;
}
.banner-close:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.15);
}

/* Page shell */
.page-shell {
  min-height: 100vh;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 16px 40px;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 40;
}

.logo {
  font-size: 18px;
  font-weight: 800;
}

nav {
  display: flex;
  gap: 20px;
  flex: 1;
}
nav a {
  font-size: 14px;
  color: #6b7280;
  text-decoration: none;
}

.nav-cta {
  background: #6366f1;
  color: #fff;
  border: none;
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.main-content {
  max-width: 640px;
  margin: 48px auto;
  padding: 0 24px;
}

.demo-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 32px;
  margin-bottom: 32px;
}

.demo-card h1 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 10px;
}
.demo-card p {
  font-size: 14px;
  color: #6b7280;
  line-height: 1.7;
  margin-bottom: 20px;
}

.demo-actions {
  display: flex;
  gap: 10px;
}

.btn-primary {
  padding: 10px 20px;
  background: #f3f4f6;
  color: #374151;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover {
  background: #e5e7eb;
}

.variants-title {
  font-size: 12px;
  font-weight: 700;
  color: #9ca3af;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

const STORAGE_KEY = "acme_banner_dismissed";
const banner = document.getElementById("banner");
const bannerClose = document.getElementById("bannerClose");
const resetBtn = document.getElementById("resetBtn");

// Restore dismissed state on load
if (localStorage.getItem(STORAGE_KEY) === "true") {
  banner.classList.add("dismissed");
}

bannerClose.addEventListener("click", () => {
  banner.classList.add("dismissed");
  localStorage.setItem(STORAGE_KEY, "true");
});

resetBtn.addEventListener("click", () => {
  banner.classList.remove("dismissed");
  localStorage.removeItem(STORAGE_KEY);
});

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

<!-- Announcement banner -->
<div class="announcement-banner" id="banner" role="banner">
  <div class="banner-inner">
    <span class="banner-icon">🎉</span>
    <p class="banner-text">
      <strong>New feature:</strong> Real-time collaboration is now available on all plans.
      <a href="#" class="banner-link">Learn more →</a>
    </p>
    <button class="banner-close" id="bannerClose" aria-label="Dismiss banner">
      <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round">
        <line x1="18" y1="6" x2="6" y2="18"/>
        <line x1="6" y1="6" x2="18" y2="18"/>
      </svg>
    </button>
  </div>
</div>

<!-- Page -->
<div class="page-shell" id="pageShell">
  <header class="site-header">
    <span class="logo">Acme</span>
    <nav>
      <a href="#">Features</a>
      <a href="#">Pricing</a>
      <a href="#">Docs</a>
    </nav>
    <button class="nav-cta">Get started</button>
  </header>

  <main class="main-content">
    <div class="demo-card">
      <h1>Announcement Banner Demo</h1>
      <p>The banner sits above the header and pushes page content down. Dismiss it to see the page shift up smoothly. Dismissed state is saved to localStorage.</p>
      <div class="demo-actions">
        <button class="btn-primary" id="resetBtn">Reset banner</button>
      </div>
    </div>

    <!-- Variant banners -->
    <div class="variants">
      <h2 class="variants-title">Color Variants</h2>

      <div class="announcement-banner announcement-banner--warning announcement-banner--static">
        <div class="banner-inner">
          <span class="banner-icon">⚠️</span>
          <p class="banner-text"><strong>Scheduled maintenance</strong> on March 10 from 2–4 AM UTC. Service may be briefly unavailable.</p>
        </div>
      </div>

      <div class="announcement-banner announcement-banner--error announcement-banner--static">
        <div class="banner-inner">
          <span class="banner-icon">🚨</span>
          <p class="banner-text"><strong>Incident in progress:</strong> API latency elevated. Our team is investigating. <a href="#" class="banner-link">Status page</a></p>
        </div>
      </div>

      <div class="announcement-banner announcement-banner--dark announcement-banner--static">
        <div class="banner-inner">
          <span class="banner-icon">⚡</span>
          <p class="banner-text">Black Friday — <strong>40% off</strong> all plans this week only. <a href="#" class="banner-link">Claim deal →</a></p>
        </div>
      </div>
    </div>
  </main>
</div>

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

Full-width announcement banner that sits above the page header. Includes icon, message text, optional CTA link, and an X dismiss button. Dismissed state persists to localStorage so it stays closed on reload.