.mask {
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 60;
}
.left-icon,.right-icon{
    color: #fff;
    font-size: 100px;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
}
.left-icon{
    left: 30px;
}
.right-icon{
    right: 30px;
}

.icon-arrow-left,.icon-arrow-right{
    position: absolute;
    top: 50%;
    transform: translate(-50%,-50%);
    text-align: center;
    max-height: 80%;
    font-size: 80px;
    color: #999;
    font-weight: bold;
}
.icon-arrow-left{
    left: 30px;
}
.icon-arrow-right{
    right: -30px;
}
.preview-img{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    text-align: center;
    max-height: 80%;
}
.preview-img img{
    width: 760px;
    height: 500px;
    object-fit: contain;
}
.preview-content{
    width: 1100px;
    margin-top: 40px;
    background: #fff;
    border-radius: 4px;
    padding: 30px 50px 70px;
}
.preview-title{
    font-size: 34px;
    font-weight: 500;
    color: #333;
    text-align: center;
}
.preview-text{
    font-size: 18px;
    color: #666;
    margin-top: 25px;
}