.left{
            width: 300px;
            height: 500px;
            border: 1px solid;
            float: left;
      }
.right{
            width: 10000px;
            height: 500px;
            display: table-cell;
            border: 1px solid;
      }
    </style>


<div class="left"></div>
<div class="right">
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Beatae dolore est et itaque nesciunt nobis officia omnis optio similique vitae. Cupiditate eum exercitationem harum id iusto maiores quaerat reprehenderit sint.
</div>

 1 <style>
 2         .right{
 3             width: 200px;
 4             height: 500px;
 5             border: 1px solid;
 6             display: table-cell;
 7         }
 8         .left{
 9             height: 500px;
10             border: 1px solid;
11             display: table-cell;
12         }
13         .parent{
14             display: table;
15             table-layout: fixed;
16             width: 100%;
17         }
18 </style>
19 
20 <div class="parent">
21     <div class="left">
22             Lorem ipsum dolor sit amet, consectetur adipisicing elit. Amet aperiam, assumenda dolores eaque, fugiat illo, in inventore itaque magni nemo nisi nulla obcaecati quaerat totam unde voluptatem voluptatum. Amet, totam.
23     </div>
24     <div class="right"></div>
25 </div>

<style>
       .parent{
           display: table;
           table-layout: fixed;
           width: 100%;
       }
        div{
            border: 1px solid;
        }
        .left,.right,.center{
            display: table-cell;
        }
        .left{
            width: 100px;
            height: 200px;
        }
        .right{
            width: 100px;
            height: 200px;
        }
</style>

 <div class="parent">
      <div class="left"></div>
        <div class="center">
       　　Lorem ipsum dolor sit amet, consectetur adipisicing elit. Alias amet delectus ducimus ea eos eum, libero modi quia, soluta temporibus unde, 
　　　　　　ut. Aliquam, dolorem ipsam porro quae quisquam saepe vitae!
        </div>
      <div class="right"></div>
</div>