I have installed the Aerialplusplus theme and adjusted the CSS code so that the logo can be larger:

.ow_header .ow_logo{  
float: left;   
margin: 150px 0 0 0px;   
background-image:url('images/logo.png'background-repeat: no-repeat;   
width: 500px;   
height: 100px;}

.ow_header .ow_logo h2{   
visibility:hidden

.ow_header .ow_logo .ow_tagline{   
visibility:hidden

This works fine in Internet Explorer but can only see a small part of the logo in Firefox, as if it hasn't taken inthe change of width and height. Please help me fix this!