You can customize Web Monitor style definitions, such as fonts and colors in template files, that you place in the ...\Microsoft Forefront Unified Access Gateway\von\Monitor\css\CustomUpdate folder.

Note the following:

Note:
Changing the style definitions requires a working knowledge of cascading style sheets.

You can use the files under the ...\Microsoft Forefront Unified Access Gateway\von\Monitor\css\ folder as a basis for your changes.