*,
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#main {
    height: 100vh;
    width: 100vw;
    position: relative;
}

iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.sidebar {
    z-index: 9999;
    height: 100%;
    position: fixed;
    top: 0;
    right: 0;
    overflow-x: hidden;
    overflow-y: hidden;
    transition: 0.5s;
    display: flex;
    flex-direction: row;
    /* 指定为弹性布局 */
    justify-content: center;
    /* 水平居中 */
    align-items: center;
    /* 垂直居中 */
}


.bottom-bar {
    z-index: 9999;
    width: 100%;
    position: fixed;
    bottom: 0;
    right: 0;
    overflow-x: hidden;
    overflow-y: hidden;
    transition: 0.5s;
    display: flex;
    flex-direction: column;
    /* 指定为弹性布局 */
    justify-content: center;
    /* 水平居中 */
    align-items: center;
    /* 垂直居中 */

}

.download-bg {
    width: 100%;
    height: 100%;
    object-fit: cover
}