title: How to make input extend to width of column in Bootstrap 3?
body: <p>I need my 2 inputs which placed inline to have width of parent div which defines <code>col-md-6</code> and <code>col-md-3</code>. Right now inputs are aligned correctly but have width which in one case less than <code>col-md-6</code> and in second case more than <code>col-md-3</code>. How to make this inputs have width <code>col-md-6</code> and <code>col-md-3</code> correspondingly?</p>
  
  <pre><code>&lt;div class="col-md-9"&gt;
      &lt;form action="" role="form" class="form-inline"&gt;
          &lt;div class="col-md-6"&gt;
              &lt;div class="form-group"&gt;
                  &lt;label for="iR" class="sr-only"&gt;i R&lt;/label&gt;
                  &lt;input type="text" class="form-control" id="iR" placeholder="some mid long explanation" /&gt;
              &lt;/div&gt;
          &lt;/div&gt;
  &lt;div class="col-md-3"&gt;
              &lt;div class="form-group"&gt;
                  &lt;label for="iS" class="sr-only"&gt;i S&lt;/label&gt;
                  &lt;input type="text" class="form-control" id="iS" placeholder="some mid long explanation 2" /&gt;
              &lt;/div&gt;
          &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>