* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #111;
    color: #f5f5f5;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 96px 24px 24px;
}

.banner {
    position: fixed;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    width: min(92%, 720px);
    padding: 14px 18px;
    border-radius: 12px;
    background: #222;
    border: 1px solid #444;
    text-align: center;
    z-index: 1000;
}

.hidden {
    display: none;
}