iframe#tumblr_controls{
white-space:nowrap; 
-webkit-filter: invert(100%); 
opacity:;
top:2px !important; 
margin: 0px; 
right:50px !important; 
position:fixed !important; 
}
.credit{
position:fixed;
height:30px;
line-height:30px;
width:42px;
height:18px;
right:7px;
top:5px;
border-radius:3px;
overflow:hidden;
z-index:99999999;
-webkit-filter: invert(100%) ;
}
.credit:hover{
-webkit-filter: invert(80%);
}