* {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', sans-serif;
            background: linear-gradient(to right, #fce4ec, #e0f7fa);
            color: #333;
        }

        header {
            text-align: center;
            padding: 60px 20px 30px;
          background: linear-gradient(to right, #fbc2eb, #a6c1ee);
            color: white;
            border-bottom-left-radius: 40px;
            border-bottom-right-radius: 40px;
        }

        header h1 {
            font-size: 38px;
            margin-bottom: 10px;
        }

        header p {
            font-size: 18px;
        }

        section {
            max-width: 1000px;
            margin: 0 auto;
            padding: 40px 20px;
        }

        h2 {
            color: lightcoral;
            margin-top: 40px;
            font-size: 26px;
        }

        h3, h4 {
            color: lightcoral;
            margin-top: 30px;
        }

        .hover-img {
            transition: transform 0.4s ease, box-shadow 0.4s ease;
            border-radius: 15px;
            width: 250px;
            height: 250px;
            object-fit: cover;
            margin: 10px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .hover-img:hover {
            transform: rotate(2deg) scale(1.05);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
        }

        .image-gallery {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            margin-top: 20px;
        }

        .info {
            background-color: #ffffffcc;
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            margin-top: 20px;
        }

        a {
            color: #00796b;
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
        }

        iframe {
            max-width: 100%;
            border-radius: 12px;
            margin-top: 20px;
        }

       footer {
  width: 100%;
  text-align: center;
  padding: 15px;
  background: pink;
  color: black;
  margin-top: 40px;
  position: relative; /* đảm bảo nằm dưới cùng nội dung */
  left: 0;
}

        @media (max-width: 768px) {
            header h1 {
                font-size: 28px;
            }

            .hover-img {
                width: 100%;
                height: auto;
            }

            .image-gallery {
                flex-direction: column;
                align-items: center;
            }
        }
        
        ul {
            list-style: none;   /* bỏ dấu chấm */
            padding-left: 20px;
        }
        
#quiz button {
  background: linear-gradient(135deg, #ff9a9e, #fad0c4);
  border: none;
  border-radius: 10px;
  padding: 10px 20px;
  margin: 5px;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
}
#quiz button:hover {
  transform: scale(1.1);
  background: linear-gradient(135deg, #a1c4fd, #c2e9fb);
}