body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}
.video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
}
.menu {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}
.menu a {
    display: inline-block;
    background-color: rgba(0, 0, 0, 0.5);
    color: white;
    text-decoration: none;
    margin: 0 15px;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 20px;
    transition: background-color 0.3s ease;
}
.menu a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}
.modal {
    display: none; /* 默认隐藏 */
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
}
.modal-content {
    background-color: rgba(0, 0, 0, 0.5);
    margin: auto;
    padding: 20px;
    border: 1px solid #888;
    width: 90%;
    height: 90%;
    text-align: center;
    border-radius: 10px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
.modal-content h2, .modal-content p {
    color: white; /* 设置弹窗内容文字颜色为白色 */
}
.close {
    color: #aaa;
    position: absolute;
    bottom: 8%;
    right: 8%;
    font-size: 28px;
    font-weight: bold;
}
.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}