SO gradient box

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.1.0/bootstrap.min.js"></script>
  <div class="container"> 

      <div class="row">
          <div class=" box">span</div>
          <div class="span4">span4</div>
          </div> <!-- end row -->
</div><!-- end container -->

<div class="container"> 

      <div class="row">
          <div class="span8">default span8</div>
          <div class="span4">default span4</div>
          </div> <!-- end row -->
</div><!-- end container -->

CSS

@import url('http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css');
.span4, .span8{
    background-color:pink;
}

.row{
    background-color:#aaa;
}
.box{
    box-sizing: border-box;
    width:620px !important;
border: 1px solid #696;
padding: 60px 0;
text-align: center; width: 200px;
-webkit-border-radius: 8px;
-moz-border-radius: 8px;
border-radius: 8px;
-webkit-box-shadow: #666 0px 2px 3px;
-moz-box-shadow: #666 0px 2px 3px;
box-shadow: #666 0px 2px 3px;
background: #EEFF99;
background: -webkit-gradient(linear, 0 0, 0 bottom, from(#EEFF99), to(#66EE33));
background: -webkit-linear-gradient(#EEFF99, #66EE33);
background: -moz-linear-gradient(#EEFF99, #66EE33);
background: -ms-linear-gradient(#EEFF99, #66EE33);
background: -o-linear-gradient(#EEFF99, #66EE33);
background: linear-gradient(#EEFF99, #66EE33);
-pie-background: linear-gradient(#EEFF99, #66EE33);
behavior: url(/pie/PIE.htc);
}

@media (max-width: 979px) and (min-width: 768px){
.box {
width: 100px !important;
}
}
@media (max-width: 767px){
.box{
width: 100% !important;
}
}

@media (min-width: 1200px){
.box {
width: 100px !important;
}
}