css, css3, flex实现圣杯布局

 <!-- 圣杯布局 -->
    <style>
        .wrapper {
            width: 500px;
            height: 540px;
            margin: 50px auto;
            border: 1px solid #dedede;
            resize: both;
            overflow: hidden;
        }
        .wrapper .title {
            line-height: 40px;
            text-align: center;
            font-size: 20px;
            height: 40px;
            box-sizing: border-box;
            border-bottom: 1px solid #dddd;
        }
        .wrapper .content {
            display: flex;
            height: calc(100% - 40px);
            width: 100%;
            flex-direction: column;
        }
        .wrapper .content .header,
        .wrapper .content .footer,
        .wrapper .content .left,
        .wrapper .content .right {
            flex: 0 0 70px;
            border: 1px solid #0ff;
            box-sizing: border-box;
        }
        .wrapper .content .center {
            flex: 1 1 auto;
        }
        .wrapper .content .center{
            display: flex;
        }
        .wrapper .content .center .center-content{
            flex: 1 1 auto;
        }
    </style>
    <div class="wrapper">
        <div class="title">flex圣杯布局</div>
        <div class="content">
            <div class="header">header</div>
            <div class="center">
                <div class="left">left</div>
                <div class="center-content">center</div>
                <div class="right">right</div>
            </div>
            <div class="footer">footer</div>
        </div>
    </div>