.site-main-content{
    column-gap: 50px;
    background-color: rgb(241, 241, 241);
}
.download-left{
    width: 350px;
}
.download-filter-section{

}
.category-header{
    padding:15px 20px;
    color: rgb(131, 129, 129);
    border:1px solid rgb(218, 218, 218);
    background-color: white;
    font-size: 16rem;
}
.download-filter-section{
    margin-top: 10px;
}
.filter-content{
    padding:10px 20px;
    font-size: 16rem;
    display: none;
    color: gray;
}
.filter-content.active{
    display: flex;
}
.filter-content input{
    display: inline-block;
}
.action-icon{
    transition: all 0.3s;
}
.action-icon.active{
    transform: rotate(90deg);
}

/* right */
.download-right{
    flex:1;
    padding:20px 0px 10px 0px;
}

.download-item-wrap{
    width: 260px;

}
.download-item-wrap .img-wrap{
    /* padding:20px 20px 10px 20px; */
}
.download-item-wrap img{
    width: 100%;
    height: auto;
}
.download-item-title{
    color:#4C98D0;
    padding:10px;
    padding-bottom: 0px;
    display: block;
    font-size: 17rem;
}
.download-item-des{
    padding:10px;
    color: rgb(161, 159, 159);
    font-size: 15rem;
}