CODE
.category_one {background-color:red; padding: 5px; }
.category_two {background-color:yellow; padding: 5px; }
QUOTE
should the one, two etc. be changed to match the actual names of my categories?
Sort of. Keep reading...
CODE
<div class="<$MTEntryCategory dirify="1"$>"> ... content here ... </div>
QUOTE
Does the "1" in the code correspond in any way to the "one" on the style sheet?
No. The dirify="1" here means (basically) to take the category name and 1) convert all letters to lower case, and 2) replace all spaces with "_" (underscore) characters. If you have a category called "My Favorites", the dirify="1" will change that into "my_favorites".
The "dirified" category name is what needs to be used in your style sheet. "category_one" is the dirified name of your first category, and "category_two" is the dirified name of your second category. For a category named "My Favorites", this is what you would have in your style sheet:
CODE
.my_favorites {background-color:red; padding: 5px; }
Hope this helps...