body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}

header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em 0;
}

h1 {
    margin: 0;
}

main {
    padding: 1em;
}

.contact {
    text-align: center;
    margin-bottom: 1em;
}

.contact-link {
    font-size: 1.5em;
    color: #fff;
    background-color: blue;
    padding: 0.5em 1em;
    text-decoration: none;
    border-radius: 5px;
}

.video-container {
    margin-bottom: 2em;
    text-align: center;
    position: relative;
}

.video-description {
    margin-bottom: 10px;
    font-size: 2em; /* 字体大小调大两倍 */
    color: #fff; /* 字体颜色设为白色 */
    background-color: blue; /* 背景颜色设为蓝色 */
    padding: 0.5em;
    border-radius: 5px;
}

video {
    width: 100%;
    height: auto;
    max-width: 100%;
}

.fullscreen-button {
    position: absolute;
    bottom: 10px;
    right: 10px;
    padding: 0.5em 1em;
    background-color: rgba(0, 0, 0, 0.5);
    color: #fff;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}