.site_center{ width:100%; text-align:center}
.main { width:780px; margin:0 auto; text-align:left }

/*======= header =======*/
#header{ height:174px; width:100%}

/*======= footer =======*/
#footer{ height:141px; width:100%}

/*======= content =======*/
#content { width:100%}

.col_1, .col_2, .col_3, .col1, .col2, .col3, .col { float:left;}