stupid css >:o

hi myspace gang <3333

something in my stupid css is not letting me put the url box / lower right-hand image in my page. this is what i've been pasting into my css:

.url {
font-size: 0px;
background: url("image url");
background-size: 310px;
position: fixed;
right: 0;
bottom: 0;
color: transparent !important;
height: 256px;
width: 256px;
border: none;
box-shadow: none;
padding: 0 !important;
z-index: 1000;
}

of course, i've been replacing "image url" with the direct url. any suggestions??