v4 - Make .card class display: block

Created by: Skwai

Cards using an anchor element are rendering as inline as the display property is inherited, eg.

<a class="card card-block" href="#">
  <h4 class="card-text">The parent is inline</h4>
  <p class="card-text">This is some text</p>
</a>

Adding display: block; to .card class would fix this.