title: Can i write col-xs-12 for all viewport..?
body: <p>I have a doubt. If I want same col size like <code>col-*-12</code> for all view port, shall I write simply <code>col-xs-12</code> (or) <code>col-xs-12</code> and <code>col-sm-12</code> (or) separate <code>col-*-12</code> classes for all view ports? </p>
  
  <p>Thanks in advance.</p>