#return_top{position:fixed;bottom:0;right:0;z-index:400;width:56px;height:56px;background:rgba(42,42,42,0.9);visibility:hidden;transition:position 0.5s;opacity:0}@media (max-width: 700px){#return_top{width:48px;height:48px}}@media (max-width: 500px){#return_top{width:40px;height:40px}}#return_top::before,#return_top::after{position:absolute;top:15px;bottom:0;left:0;right:0;margin:auto;content:"";display:block}@media (max-width: 600px){#return_top::before,#return_top::after{top:12px}}#return_top::before{width:24px;height:24px;border-left:2px solid #fff;border-top:2px solid #fff;transform:rotate(45deg)}@media (max-width: 700px){#return_top::before{width:20px;height:20px}}@media (max-width: 500px){#return_top::before{width:18px;height:18px}}#return_top.on{position:fixed;visibility:inherit;opacity:0.8}@media (max-width: 900px){#return_top.position_change{bottom:68px;right:4px;border-radius:50%;transform:scale(0.8)}}@media (max-width: 500px){#return_top.position_change{bottom:64px}}#return_top.position_change_2{display:none}