It would be okay if I were Urs, or even used Firefox with a css plugin doodah but I am just a teacher and CASCADING style sheets are a biatch.
I look in standard styes colours for highlight and find that it is green not the orange I am seeing on my theme. They cascade, I am not sure in which of them is the colour that I need to change. I only ever wanted to change only the most basic of things - high-lighting & borders. It should be easy.
$THEME->body = "#FFFFFF"; // Main page color
$THEME->cellheading = "#FFFFFF"; // Standard headings of big tables
$THEME->cellheading2 = "#EAFFF2"; // Highlight headings of tables
$THEME->cellcontent = "#FFFFFF"; // For areas with text
$THEME->cellcontent2 = "#22FF22"; // Alternate colour
$THEME->borders = "#22FF22"; // Table borders
$THEME->highlight = "#222222"; // Highlighted text (eg after a search)
$THEME->hidden = "#22FF22"; // To color things that are hidden
$THEME->autolink = "#22FF22"; // To color auto-generated links (eg glossary)
for those of us that just want to change the basics with defaults of "null" meaning cascaded style sheets are used.
Urs is wonderful, but we are not, so give us the opportunity to make the basic tweaks without CSS zen