title: Customize input box and button width inside input group in bootstrap 3
body: <p>I have a search box like that</p>
  
  <p><a href="https://i.stack.imgur.com/Ks4UN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ks4UN.png" alt="enter image description here"></a></p>
  
  <p><strong>Code</strong></p>
  
  <pre><code>&lt;div class="input-group"&gt;
       &lt;input name="search" value="" class="form-control" placeholder="Search" type="text" &gt;
       &lt;span class="input-group-btn"&gt;
          &lt;button class="btn btn-default" type="submit"&gt;&lt;span class="icon-search"&gt;&lt;/span&gt;&lt;/button&gt;
       &lt;/span&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Here search box is 100%. </p>
  
  <p>I want to customize search box and search button size 80% and 20%</p>
  
  <p>actually I want to make my search box like that 
  <a href="https://i.stack.imgur.com/oP5Lw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oP5Lw.png" alt="enter image description here"></a></p>
  
  <p>Any Idia?</p>