OK understood now.
The profile is
member_view template. As I already said. That edits all profile pages.
member_view.css edits stuff like colours.,
Experiment with the css one at a time on the css page. It will show on a tab beside the main template.
Change one item to a totally unusual colour for your site if you're not sure what you're changing.
Then it will show up easily.
I suggest you post a new question in
Styling and Customization Questions
Ask how to use a conditional show selected colours on your own Profile page, but not on others.
That will avoid misunderstanding.
It may be useful to copy the
member_view.css and make a duplicate perhaps
member_view_me.css
Then you could bracket the whole of the content area in a conditional which works this css.
I'm not quite able to do the conditional either, sorry but I can see it could be done.
The conditional might work off th
e title line at the top of
member_view
to link to the alternate css if the user ID is yours. Something like that.