Box Handler should use CSS to style its box. (Closes #1070)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5399 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

theme/default/style.css

@@ -159,3 +159,12 @@ div.olControlMousePosition {
   background-image: url("img/draw_polygon_on.png");
   background-repeat: no-repeat;
 }
+
+.olHandlerBoxZoomBox {
+    border: 2px solid red;
+    position: absolute;
+    background-color: white;
+    opacity: 0.50;
+    font-size: 1px;
+    filter: alpha(opacity=50);
+}