#coluna-central{    width:636px;    min-height:45px;    float:left;    margin-left:6px;    margin-bottom:10px;}#coluna-direita {    width:170px;    float:left;    margin-left:6px;    margin-bottom:10px;}#coluna-esquerda {    width:170px;    float:left;    margin-left:6px;    margin-bottom:10px;}