css -- 高度相等的列 -- 3列高度相等

<div class="wrapper">
    <div class="box">
        <h1>wo shi hao ren</h1>
        <p>...</p>
        <div class="bottom"></div>
    </div>

    <div class="box">
        <h1>wo shi hao ren</h1>
        <p>...</p>
        <div class="bottom"></div>
    </div>

    <div class="box">
        <h1>wo shi hao ren</h1>
        <p>...</p>
        <div class="bottom"></div>
    </div>
</div>

.wrapper{
    width: 100%;
    overflow: hidden;
    position: relative;
}
.box{
    width: 250px;
    padding-left: 20px;
    padding-right: 20px;
    padding-top: 20px;
    padding-bottom: 520px;
    margin-bottom: 500px;
    margin-left: 20px;
    float: left;
    display: inline;
    background: url(../images/a.jpg) #ccc top left no-repeat;
}
.bottom{
    position: absolute;
    bottom:;
    height: 20px;
    width: 290px;
    background: url(../images/a.jpg) #ccc bottom left no-repeat;
    margin-left: -20px;
}