div#bt a{position:fixed;bottom:15px;right:15px;cursor:pointer;z-index:99999999;max-width:64px;border-radius:1px;padding:4px 3px 2px}div#bt a:hover img::before{content:"aa"}div#bt a img{border-radius:12px;border:0}div#bt:hover:before{opacity:1!important}html,body{touch-action:manipulation}