Second: Please give problem code and a description of what is going wrong. The post is almost as vague as "I have a problem with css, how do I fix it?" which tells us almost nothing.
Third: Welcome to web programming. When I started in 2000, no browser complied to the standard. Fast forward 13 years, and still we have variances even if things are vastly better now.
I suggest you read the post at the top of the forum, it gives guidance about how to ask a question.