a.back-to-top{border-radius:50%;bottom:35px;cursor:pointer;display:none;height:40px;padding-top:8px;position:fixed;text-align:center;width:40px;z-index:99999999}.bounce{-moz-animation:bounce 2s infinite;-webkit-animation:bounce 2s infinite;animation:bounce 2s infinite}@keyframes bounce{0%,20%,50%,80%,to{transform:translateY(0)}40%{transform:translateY(-2px)}60%{transform:translateY(-2px)}}