title: Why div table cannot display border-right?
body: <p>recently I want to build a table by <code>div</code>. I have set most of the setting.
  However, when I input <code>border-right</code>. It does not show the border. Here is my code:</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.Forum{
      margin-top: 5px;
      display: table;
      padding: 3px;
      width: 95%;
      background:#6f7c85;
      border-radius: 5px;
  }
  
  .Forum .tableRow{
      display: table-row;     
  }
  
  .Forum .tableRow .tableCell1{
      display: table-cell;
      width: 40%;
  }
  
  .Forum .tableRow .tableCell2{
      display: table-cell;
      width: 20%;
  }
  .Forum .tableRow .tableCell3{
      display: table-cell;
      width: 20%;
      background: #e5eaef;
      border-right: 10px;
  }
  
  .Forum .tableRow .tableCell4{
      display: table-cell;
      width: 20%;
      background: #e5eaef;
      text-align: center; 
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class = "Forum"&gt;
      &lt;div class = "tableRow"&gt;
          &lt;div class = "tableCell1" style = "text-align:center; color:white;"&gt;
          Thread
          &lt;/div&gt;
          &lt;div class = "tableCell2" style = "text-align:center; color:white;"&gt;
          Posted By
          &lt;/div&gt;
          &lt;div class = "tableCell2" style = "text-align:center; color:white;"&gt;
          Last Post
          &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class = "tableRow"&gt;
          &lt;div class = "tableCell3"&gt;Cotent 1&lt;/div&gt;
          &lt;div class = "tableCell4"&gt;Chris&lt;/div&gt;
          &lt;div class = "tableCell4"&gt;Today&lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  <p>I tried to apply  <code>border-collapse: collapse</code> to <code>.Forum</code>. However, it didn't work and it block the outer div also.
  How can I fix it? Thank you!</p>