title: what to do with css top value differences in chrome and firefox?
body: <p>The css top or margin-top values in chrome is so different with firefox and opera,what should I do?
  For example in chrome when I put (top:0px;) my menu is in its right place,but in firefox I have to put (top:-80px;).</p>
  
  <p>What should I do?please help;Thanks in advance.</p>
  
  <p>and also firebug doesn't have any errors.
  Sorry I couldn't post a jsfiddle link because the site contains lots of pictures and I reaaly wanted to post pictures so that you can understand what I mean better,I tried but I needed 10 reputation but I have only 8.</p>