纯css实现div左右等高

<style>
    .row-wrap {
        overflow: hidden;
    }

    .row1,
    .row2 {
        margin-bottom: -1000px;
        padding-bottom: 1000px;
    }

    .row1 {
        width: 120px;
        background: #F2F2F2;
        float: left;
    }

    .row2 {
        width: 300px;
        background: #81C0F2;
        color: #FFF;
        float: left;
        _margin-right: -6px;
    }

</style>

<div class="row-wrap">
    <div class="row1">
        <p>内容1</p>
    </div>
    <div class="row2">
        <p>内容2</p>
    </div>
</div>