#gotobottom {
   position:fixed;
   z-index:5000;
   bottom:85px;
   right:25px;
   background:url("https://www.sprungfreres.fr/wp-content/stb-images/ui.tobottom.png") no-repeat top left;
   text-indent:-9999em;
   width:51px;
   height:51px;
      display:none;
   }
#gotobottom:hover,
#gotobottom:active,
#gotobottom:focus {
   outline:0;
}