CSS: 2 colonnes fixes + 1 colonne variable

astuce en css 3columns
 <div style=" float:left ; width:200px;    background-color:red;  margin-right:20px; ">AAAAAAA</div> <div style=" float:left; width:200px;     background-color:blue; margin-right:20px;  ">BBBBBBB</div> <div style=" overflow:hidden; width:auto;     background-color:green;   ;">CCCCCCCCCCC</div>
footer.php