html-css-review: Do not use direct descendant / HTML entity selectors

static/css/mentoring-table.css

@@ -28,7 +28,7 @@
     width: 20%;
 }
 
-.mentoring-table td:first-of-type > div {
+.mentoring-table .mentoring-column {
     min-height: 500px;
 }
 

templates/html/mentoring-table-column.html

 <td>
+  <div class="mentoring-column">
   {% for name, c in named_children %}
-  {{c.body_html|safe}}
+    {{c.body_html|safe}}
   {% endfor %}
+  </div>
 </td>