diff --git a/examples/style.mobile.css b/examples/style.mobile.css
index 8ee1a63f78..d8e1c915e6 100644
--- a/examples/style.mobile.css
+++ b/examples/style.mobile.css
@@ -19,6 +19,7 @@ div.olControlZoom a {
     height: 32px;
     width: 32px;
     line-height: 28px;
+    text-shadow: 0 0 3px rgba(0,0,0,0.8);
     background: #666666; /* fallback for IE - IE6 requires background shorthand*/
     background: rgba(0, 0, 0, 0.3);
     filter: alpha(opacity=60);
diff --git a/theme/default/style.css b/theme/default/style.css
index f98ac210ce..f63f4acf8e 100644
--- a/theme/default/style.css
+++ b/theme/default/style.css
@@ -447,6 +447,7 @@ div.olControlZoom a {
     height: 22px;
     width:22px;
     line-height: 19px;
+    text-shadow: 0 0 3px rgba(0,0,0,0.8);
     background: #666666; /* fallback for IE - IE6 requires background shorthand*/
     background: rgba(0, 0, 0, 0.3);
     filter: alpha(opacity=60);