Fix col-xs-6 in header.php

protected/views/_includes/header.php

@@ -21,7 +21,7 @@
 
                 <div class="row">
 
-                    <div class="col-sm-6">
+                    <div class="col-xs-6">
 
                 <?php } ?>
 
@@ -31,7 +31,7 @@
 
                     </div>
 
-                    <div class="col-sm-6">
+                    <div class="col-xs-6">
 
                         <nav class="btn-toolbar"><?php echo $nav;?></nav>