... TWiki ? ... This line loads the extra style definition: * Set USERSTYLEURL = %ATTACHURL%/centerpageborder.css You can write this line in TWikiPreferences , in WebPreferences , in your user topic or on a single page. ... If you don't write this overloading style in a template and use an external .css file, you need to set the image to the absolute url: You can always write a <style> in a topic - all current browsers support this - but the page won't validate as valid XHTML. ... TWikiContributor . ...