.backtop{position:fixed;right:10px;bottom:25px;width:40px;height:40px;z-index:500;background:var(--color1);cursor:pointer;opacity:0;visibility:hidden;border-radius:50%;transform:translateY(20px);transition:all .5s;border:1px solid var(--white)}.backtop:hover{background:var(--white);border-color:var(--color1)}.backtop:hover:after{border-top-color:var(--color1);border-right-color:var(--color1)}.backtop.visible{opacity:1;visibility:visible;transform:translateY(0)}.backtop:after{content:"";display:block;width:10px;height:10px;border-top:2px solid var(--white);border-right:2px solid var(--white);position:absolute;top:50%;left:50%;transform:translate(-50%,-25%) rotate(-45deg)}