.page-aside{display:none;position:fixed;right:20px;top:50%;transform:translateY(-50%);width:40px;height:40px;background:#ffffff;border-radius:50%;box-shadow:0 0 8px 0 rgba(31,31,43,0.1);z-index:999;overflow:hidden}.page-aside_box{position:relative;width:100%;height:100%}.page-aside_box .page-aside-top{cursor:pointer;position:relative;margin:0 auto;width:40px;height:40px;background:#616164}.page-aside_box .page-aside-top:hover{opacity:.8}.page-aside_box .page-aside-top::after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%, -50%);width:24px;height:24px;background-size:100% 100%;background-repeat:no-repeat;background-image:url(../images/icon/icon_top.png)}@media screen and (max-width:750px){.page-aside{display:none}}