[Button] Vertical basic coloured buttons are not aligned properly

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Using code from http://semantic-ui.com/elements/button.html#basic-buttons

The following aren't aligned properly:

<div class="ui vertical buttons">
  <button class="ui red basic button">One</button>
  <button class="ui blue basic button">Two</button>
  <button class="ui green basic button">Three</button>
</div>

Edited using dev tools in chrome:

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Quick as always. Thanks! 👍