diff --git a/css/ol.css b/css/ol.css
index 435276a222..5e679f5ddc 100644
--- a/css/ol.css
+++ b/css/ol.css
@@ -78,8 +78,8 @@
   }
 }
 .ol-zoom-in {
-  border-radius: 4px 4px 0 0;
+  border-radius: 2px 2px 0 0;
 }
 .ol-zoom-out {
-  border-radius: 0 0 4px 4px;
+  border-radius: 0 0 2px 2px;
 }