/* 头部 */
.return{
    width: .2rem;
    height: .2rem;
}
#header .logo {
    margin-left: 0rem;  
}
#header{
    background: #f3f3f3;
}

/* 标题 */
.main_title{
    width: 100%;
    height: .55rem;
    margin-bottom: .17rem;
}

/* 导航栏 */
#nav{
    height: .37rem;
    display: flex;
    justify-content: space-between;
    text-align: center;
    margin-top: .02rem;
}
#nav a{
    width: 19.8%;
    height: .37rem;
    line-height: .37rem;
    background: #e3e3e3
}
#nav a:hover{
    background: #de161c;
    color: #fff;
    font-weight: bold;
}

#nav .on{    background: #de161c;
    color: #fff;
    font-weight: bold;}

/* 各种图片 */
.list_img{
    padding: .25rem .15rem .15rem .15rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}
.list_img .img_box{
    width: 1.65rem;
    height: 2.5rem;
    margin-bottom: .1rem;
}