通过三个子元素平分父元素
<div class="Row">
<div class="Column">C1</div>
<div class="Column">C2</div>
<div class="Column">C3</div>
</div>
.Row
{
display: table;
width: 100%; /*Optional*/
table-layout: fixed; /*Optional*/
border-spacing: 10px; /*Optional*/
}
.Column
{
display: table-cell;
background-color: red; /*Optional*/
}