@media (max-width:40em){.to_top{display:none}}@media (min-width:40em){#to_top{background:url(/top_var/to_top/to_top.png) no-repeat;width:100px;height:100px;overflow:hidden;display:none;position:fixed;right:1%;bottom:5%;z-index:999}#to_top:hover{background:url(/top_var/to_top/to_top_over.png) no-repeat}}