This is where you'll place what would normally go in your forum's style sheet or what would normally be between <style> tags. Try to code your mini-profile's HTML in a way that will allow you to target it specifically with your selectors. For example, you can surround all of the content in your HTML with a <div> element with a class and target that class and its child elements specifically with your CSS. That way you don't accidentally target every mini-profile on the page with CSS that was meant for the one you're building. One more thing: The forum theme's CSS still applies beforehand, so your mini-profile may look right in one theme but not in another. The best way to circumvent this is to define as many styles as you can to override the theme's CSS.