To write separate CSS for mac os ,Copy the below script into the head tag of your page <script type="text/javascript"> var csstype="inline" //Specify type of CSS to use. "Inline" or "external" var mac_css='body{font-size: 14pt; }' //if "inline", specify mac css here var pc_css='body{font-size: 12pt; }' //if "inline", specify PC/default css here var mac_externalcss='/style/macstyle.css' //if "external", specify Mac css file here var pc_externalcss='/style/pcstyle.css' //if "external", specify PC/default css file here ///////No need to edit beyond here//////////// var mactest=navigator.userAgent.indexOf("Mac")!=-1 if (csstype=="inline"){ document.write('<style type="text/css">') if (mactest) document.write(mac_css) else document.write(pc_css) document.write('</style>') } else if (csstype==...