div+css实现两列布局实例

.mainBox{
width: 960px;
height: 300px;
background: #cff;
margin: 0 auto;
}
.leftBox{
width: 740px;
height: 300px;
background:#C9F;
float: left;
margin-right: 10px;
}
.rightBox{
width: 210px;
height: 300px;
background: #fcf;
float: left;
}