Cill someone please suggest to me what the problem is?
Best if you upload your problem page to the web and provide a link so we can see what you've done.
If it has been entered correctly, it will work as described. So, obviously there's an error somewhere. But as John points out, we need to see what you have done to identify the problem.
It would also help if you describe what does happen. Saying that something doesn't work is only half the story. If something unexpected happens, it often gives a clue as to where the mistake lies.
Common errors in CSS are mixing up colons and semicolons (or leaving them out). You also need to check that your opening and closing curly braces match. Also, the colour used in one of the rules is
#00b4e1. The first two characters after the hash sign are zeros, and the final character is the number one. It's little errors that can make a big difference.
Thank you David. I had read that same color code with an "l" instead of a one. Solved it!