added .hidden-xs to .box-tools searchbar to avoid overlapping

pages/tables/simple.html

@@ -781,7 +781,7 @@
               <h3 class="box-title">Responsive Hover Table</h3>
 
               <div class="box-tools">
-                <div class="input-group input-group-sm" style="width: 150px;">
+                <div class="input-group input-group-sm hidden-xs" style="width: 150px;">
                   <input type="text" name="table_search" class="form-control pull-right" placeholder="Search">
 
                   <div class="input-group-btn">