improve game graph design

src/Mine/SeekerBundle/Resources/public/js/mine-seeker/grid/grid-control.js

@@ -413,7 +413,9 @@ class GridControl extends React.Component {
                 </div>
                 <UserControl ref="userControl"
                              bombClear={this.bombClear.bind(this)}/>
-                <div className="grid"> {grid} </div>
+                <div className="grid-container">
+                    <div className="grid"> {grid} </div>
+                </div>
             </div>
         );
     }