...
<div class="text-field">
      <form method="post" name="colour-input-form" action="">
        <div class="col-md-10 col-md-offset-1 input-group">
          <input type="text" id="userInput" placeholder="Press 'Enter' to move on." class="form-control" />
        </div>
      </form>
    </div>
...