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<style>

 .sidebar {
     position: fixed;
     width: 200px;
     height: 400px;
     background: #000;
 }
 .content {
     margin-left: 200px;
     height: 500px;
     width: auto;
     position: relative;
     background: #f00;
     overflow: auto;
     z-index: 1;
 }
 .info {
     width: 1440px;
     height: 300px;
     position: relative;
     background: #f55;
 }
</style> 

<div class="sidebar"></div>
<div class="content">
    <div class="info"></div>
</div>