/* 隐藏弹出窗口，初始状态下 */
.popup {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.8);
}

/* 视频播放器的样式 */
#video-player {
    margin: 10% auto;
    display: block;
}

/* 关闭按钮的样式 */
.close-btn {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
}

.close-btn:hover,
.close-btn:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* 图片缩略图的样式 */
.thumbnail img {
    width: 171px;
    height: auto;
    border: 1px solid #ccc;
    transition: 0.3s;
}

.thumbnail img:hover {
    border-color: #777;
}