Bootsstrap Base page

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
<div class="container">
  <div class="row row-centered">
    <div class="col-xs-8">
      <h3>
  Quick Search
 </h3>
      <form role="form" action="post" method="post">
       
        <div class="col-xs-8 col-md-3 col-lg-3">
        <div class="form-group">
            <div class="input-group">
            
           

              <select class="form-control input-sm" name="location">
                <option value="" disabled selected>Location</option>
                 <option value="London">London</option>
                <option value="Bristol">Bristol</option>
                <option value="Manchester">Manchester</option>
              </select>
            </div>
          </div>
        </div>

    
          <div class="col-xs-8 col-md-3 col-lg-3">
              <div class="form-group">
            <div class="input-group">
              <select id="skill" name="skill" class="form-control input-sm" ">
                              <option value=" " disabled selected>Type of editor</option>
                              <option value="">
                             All editors
                              </option>
                  <option value="offline">
                    Offline editor
                  </option>
                  <option value="online">
                    Online editor
                  </option>
   <option value="offline,online ">Offline & Online editor</option>
           </select>
                        
                          </div>
                        </div>
                         </div>

                     

       <div class="col-xs-8 col-md-3 col-lg-3 ">
         <div class="form-group ">
                     
                          <div class="input-group ">
<select...

CSS

.input-sm {
    min-width: 160px !important;
  }