.mydiv{ position:fixed;bottom:0;right:0;z-index:999;}
.mydiv img
{
float: left; 
mergin: 15px; 
-webkit-transition: mergin 0.5s ease-out; 
-moz-transition: mergin 0.5s ease-out; 
-o-transition: mergin 0.5s ease-out; 
}
.mydiv img:hover{mergin-top: 2px; src:"https://images.cnblogs.com/cnblogs_com/ssvip/995359/o_timg35.jpg;" }
.mydiv a:hover{cursor:crosshair }