<div class="g-bd1 f-cb">
    <div class="g-sd1">
        <p class="red">左侧定宽</p>
    </div>
    <div class="g-mn1">
        <div class="g-mn1c">
            <p class="green">右侧自适应</p>
        </div>
    </div>
</div>

/*base布局块颜色*/
p{height: 150px; padding: 10px; color: #FFF;}
.red{background:red;}
.green{background:green;}
.blue{background:blue;}

/* 两列右侧自适应布局 */
.g-bd1{margin:0 0 10px;}
.g-sd1{position:relative;float:left;width:190px;margin-right:-190px;}
.g-mn1{float:right;width:100%;}
.g-mn1c{margin-left:200px;}