title: Border-Collapse in Material Design Table
body: <p>How to add something like that:</p>
  
  <pre><code>border-collapse: collapse;
  </code></pre>
  
  <p>in Material Design Table?</p>
  
  <p>When I add border code to <strong>.mat-cell</strong>:</p>
  
  <pre><code>.mat-cell {
      border: 1px solid;
  }
  </code></pre>
  
  <p>in some places the border looks like 2px.</p>
  
  <p>I would like to add a border because I would like to change the color at the hover.</p>
  
  <p><strong>Stackblitz:</strong>
  <a href="https://stackblitz.com/edit/angular-bmnxfa-jmgwnp" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-bmnxfa-jmgwnp</a></p>