CodePen

HTML

            
              <div class="sidebar-wrap">
    <div class="sidebar-content">
      
    </div>
  </div>
  <div class="main-wrap">
    <div class="post">
      <div class="post-content">
        Lorem
      </div>
      <div class="meta-content">
        Lorem
      </div>
    </div>
  </div>
  <div class="meta-background"></div>
            
          
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CSS

            
                .sidebar-wrap {
    top: 0;
    left: 0;
    width: 25%;
    height: 100%;
    position: fixed;
    background: #333;
  }

  .main-wrap {
    margin-left: 25%;
    width: 75%;
    float: left;
    min-height: 100%;
  }

  .post {
    width: 100%;
    margin: 100px 0 50px;
    .post-content {
      min-height: 150px;
      background: red;
      width: 66%;
      margin: 0px 9%;
      float: left;
    }
    .meta-content {
      min-height: 150px;
      background: red;
      z-index: 999;
      width: 16%;
      float: left;
      padding: 0;
      margin: 0;
      text-align: center;
    }
  }

  .meta-background {
    top: 0;
    right: 0;
    width: 12%;
    background: #F5F5F5;
    min-height: 100%;
    z-index: 1;
    position: fixed;
  }
            
          
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