When WebCream renders a GUI window, it uses renderers to generate a portion of HTML that represents the Java component. For example, a JButton is represented by <INPUT type="button"> HTML element, and each container is represented with a <DIV> element. For all logical components WebCream defines corresponding CSS styles. Thus, the job of customization becomes finding the right stylesheet and redefining the styles to make the page look the way you want it. WebCream themes are implemented with CSS styles and images. Obviously, customizing the stylesheet is the easiest and the best way to achieve "company look and feel" where you will make WebCream application follow the guidelines for colors and fonts established by your company.
The best way to familiarize yourself with the generated HTML is to run WindowsThemeDemo and look at the source
page using browser's View Source option. You will see in the page header that each page includes a link similar to the one below
<link rel=stylesheet href="http://www.creamtec.com/webcream/Windows_docs/css/webcream/styles_common.css">
The specific directory and the file name is determined by HTML theme specified in the application properties file. All standard WebCream styles are defined in styles_common.css, and if you open it you would see styles such as window, label, button, errorMessage and others. styles_common.css is included in all pages, followed by styles_ie.css for all browsers except for Firefox which uses styles_ns. This allows you to achieve different look and feel for different browsers.
The cleanest place for custom style definitions and overrides is css/custom.css. This file is included after all default stylesheets allowing you to isolate your changes and making future upgrades easier.