minor modification in sizes of step 1 and step 2

Author: Gaurav SinghaRoy

app/views/query/builder.html.erb

@@ -7,7 +7,7 @@
             </div>
         </div>
         <div class="row">
-            <div class="col-md-3">
+            <div class="col-md-4">
                 <div class="panel panel-primary" >
                     <div class="panel-heading">STEP 1 : Select Dataset</div>
                     <div class="panel-body">
@@ -30,7 +30,7 @@
                     </div>
                 </div>
             </div> 
-            <div class="col-md-3" id="div_qb_select_class" style="display:none;">
+            <div class="col-md-4" id="div_qb_select_class" style="display:none;">
                 <div class="panel panel-primary">
                     <div class="panel-heading">STEP 2 : Select Class</div>
                     <div class="panel-body">