Download browser-specific-css.js and include before closing </body>. follow css styling guide http://www.idiotinside.com/browser-specific-css/

<script src="browser-specific-css.js"></script>
<style> #browserbox{ width:70%;height:250px; background:#444; color:#FFF; text-align:center; padding:40px;} .win.firefox #browserbox{ background:#E07629; } .win.chrome #browserbox{ background:#4BB549; } .win.safari #browserbox{ background:#409CCB; } .win.opera #browserbox{ background:#CC0F16; } .win.ie6 #browserbox{ background:#CCCCCC; } .win.ie7 #browserbox{ background:#B0102A; } .win.ie8 #browserbox{ background:#F8D518; } .win.ie9 #browserbox{ background:#B63249; } .win.ie10 #browserbox{ background:#00A4EF; } .mac.safari #browserbox{ background:#E1006A; } .mac.firefox #browserbox{ background:#4E69A3; } .ios #browserbox{ background:#682B67;} </style>