title: Why don't my two columns fill up top column?
body: <p>I am learning to create a responsive website and have following problem:
  I have two columns (col-6) that need to fill up an upper column (col-9). Col-9 is centered and I need two columns (col-6) inside col-9.
  HTML:</p>
  
  <pre><code>&lt;div class="row col-12 troeven-0"&gt; 
  &lt;div class="col-container col-9 col-center-block troeven-1"&gt; 
  &lt;div class="colom col-6 goedkoop"&gt;
   &lt;h2 class="troeven"&gt;
     GOEDKOOP
   &lt;/h2&gt;
   &lt;img src="goedkoop.jpg" width="400" height="155" alt="goedkoop" /&gt;
   &lt;/div&gt;
    &lt;div class="colom col-6 responsive"&gt;
   &lt;h2 class="troeven"&gt;
     RESPONSIVE
    &lt;/h2&gt;
   &lt;img src="goedkoop.jpg" width="400" height="155" alt="goedkoop" /&gt;
   &lt;/div&gt;
   &lt;/div&gt; 
  &lt;/div&gt;
  </code></pre>
  
  <p>CSS:</p>
  
  <pre><code>@media only screen and (min-width: 768px) {
  /* For desktop: op PC (of bij een minimum van 768px hebben alle kolommen onderstaande breedte*/
  .col-1 {width: 8.33%;}
  .col-2 {width: 16.66%;}
  .col-3 {width: 25%;}
  .col-4 {width: 33.33%;}
  .col-5 {width: 41.66%;}
  .col-6 {width: 50%;}
  .col-7 {width: 58.33%;}
  .col-8 {width: 66.66%;}
  .col-9 {width: 75%;}
  .col-10 {width: 83.33%;}
  .col-11 {width: 91.66%;}
  .col-12 {width: 100%;}
  }
  
  .troeven-0 {
   height: auto;
   }
  
   .troeven-1 {
    height: auto;
    padding: 0px;
     }
  
   .goedkoop {
    height: auto;
    text-align: center;
    padding: 30px;
    background: red;
     }
  
   .responsive {
    height: auto;
    text-align: center;
    padding: 30px;
    background: blue;
    }
  </code></pre>
  
  <p>Are there too many columns inside eachother or a column too less? Greatly appreciate the help :)</p>