CSS:Div定位…帮助

向左和向右浮动div并清除页脚。您还需要调整左div和右div的宽度,使它们适合同一行。

#left
{
    position:static;
    width: 40%;
    height: 50px;
    margin-top: 10px;
    margin-right: 10px;
    background: #111111;
    border: solid 3px #ff0000; 
    float: left;
}

#right
{
    position:static;
    width: 40%;
    height: 50px;
    margin-top: 10px;
    margin-right: 10px;
    background: #111111;
    border: solid 3px #ff0000;
    float: left;
}

#footer
{
    position: static;
    width   : 100%;
    height  : 50px;
    margin-top: 10px;

    background: #111111;
    border: solid 3px #ff0000;
    text-align: center;
    clear: both;
}

<div><div style="float:left">a</div> <div style="float:left">b</div></div>
<div style="clear:both"></div>