topic moved to "design help" forum.
VisioList default skin "Parabola" (and hopefully all user contributed skins) include a user.css file which can be used to "override" the settings found in screen.css. This allows the skin developer to add new style elements in future versions without forcing all users to re-apply all their changes to the CSS file. If you want to change any background colors, font families, text colors, borders etc user.css is the place to do it, this will help make upgrades easier in the future.
changin colors is easy, just some css tweaks
go to admin -> settings -> skins & categories -> edit
then click on user.css you will want to add
background: #2d0077;
to any class where you want the background to be dark purple
and:
color: #2d0077;
if you have any questions, do not hesitate to ask