Treba:
Kód:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
     "http&#58;//www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http&#58;//www.w3.org/1999/xhtml" xml&#58;lang="cs" lang="cs">
<head>
   <title>aaa</title>
</head>   
<body>
   <div style="width&#58; 100%;background-color&#58; red;padding&#58;2px;">
      <div style="width&#58; 50%; background-color&#58; blue; float&#58; left; ">aaa</div>
      <div style="width&#58; 50%; background-color&#58; green; float&#58; right;">bbb</div>
      <div style="clear&#58;both;"></div>
   </div>
</body>
</html>
S podruznostmi jako paddingy a marginy si uz lze hrat dle libosti