#pagetop_bt{
position:fixed;
bottom:0px;
right:30px;
z-index:9;
}

#pagetop_bt a:hover img{
-webkit-filter: brightness(1.0) !important;
-moz-filter: brightness(1.0) !important;
filter: brightness(1.0) !important;
animation: rumble 0.15s linear infinite;
}
 
@keyframes rumble{
	0%	{transform:rotate(0deg)	translate(0,0);}
	12.5%	{transform:rotate(0.4deg)	translate(1px,-1px);}
	25%	{transform:rotate(0.8deg)	translate(0px,1px);}
	37.5%	{transform:rotate(0.4deg)	translate(-1px,0);}
	50%	{transform:rotate(0deg)	translate(0,0);}
	62.5%	{transform:rotate(-0.4deg)	translate(1px,0);}
	75%	{transform:rotate(-0.8deg)	translate(0,1px);}
	87.5%	{transform:rotate(-0.4deg)	translate(-1px,-1px);}
	100%	{transform:rotate(0deg)	translate(0,0);}
}