.preview {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 99;
}
.preview .preview_black{
    width: 100%;
    height: 100%;
    background: #0000008c;
    position: absolute;
}
.preview .preview_main{
    position: relative;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}
.preview_main .show {
    height: 100%;
}
.preview_main .closed {
    position: absolute;
    right: 10px;
    top: 10px;
    font-size: 20px;
    color: #fff;
    z-index: 99;
}
.preview_main .preview_page i {
    font-size: 30px;
    font-weight: bolder;
}
.preview_main .preview_page {
   
    color: #fff;
    z-index: 99;
    position: absolute;
    width: 100%;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    box-sizing: border-box;
}
.preview_action {
    width: 282px;
    height: 44px;
    padding: 0 23px;
    background-color: #606266;
    position: absolute;
    left: 50%;
    bottom: 30px;
    transform: translateX(-50%);
    border-color: #fff;
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    color: #fff;
}
.preview_action i {
    font-size: 18px;
}
.leftx {
    transform: rotateY(180deg);
}