 <p>You have to do following steps.</p> <ol> <li>Go to the admin and see what theme/template you are using for your store.</li> <li>Then go to app/design/frontend </li> <li>Locate your theme package</li> <li>Then locate page.xml file. It should be under app/design/frontend/themackage/default/layout This xml file shall let you know about all the different css being used in your theme.</li> <li>Identify your css file.</li> <li>Then go to skin/front/your them package.</li> </ol> <p>Here you will find your css file. </p> <p>You can change the css element in your target file.</p>