SOURCE

 <div class="content">
    <div class="left">im left</div>
    <div class="main">im center</div>
    <div class="right"> im right</div>
 </div>

 *{
        padding: 0px;
        margin:0px;
    }
    .content{
        width: 100%;
        height:300px;
    }
    .left{
        width: 200px;
        height: inherit;
        position: absolute;
        z-index: 1;
        background: bisque;
    }
    .main{
        width: 100%;
        height: inherit;
        background: cadetblue;
        position: relative;
        box-sizing: border-box;
        padding: 0 200px;
    }
    .right{
        width: 200px;
        height: inherit;
        background: bisque;
        position: absolute;
        top:0;
        right:0;
        z-index: 1;
    }