body {
      font-family: Arial, sans-serif;
      background: #f5f5f5;
      padding: 20px;
    }

    h1 {
      text-align: center;
      margin-bottom: 30px;
    }

    .video-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 20px;
    }

    .video-thumbnail {
      position: relative;
      cursor: pointer;
      background: #000;
      overflow: hidden;
      border-radius: 10px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.2);
      transition: transform 0.2s;
    }

    .video-thumbnail:hover {
      transform: scale(1.02);
    }

    .video-thumbnail img {
      width: 100%;
      display: block;
    }

    .play-button {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 68px;
      height: 48px;
      background: url('https://img.icons8.com/ios-filled/100/ffffff/play-button-circled.png') no-repeat center center;
      background-size: contain;
      pointer-events: none;
      opacity: 0.9;
    }

    iframe {
      width: 100%;
      height: 315px;
      border: none;
      border-radius: 10px;
    }