--- a/langtools/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/stylesheet.css	Wed Mar 29 10:27:23 2017 +0200
+++ b/langtools/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/resources/stylesheet.css	Wed Mar 29 09:41:36 2017 -0700
@@ -787,3 +787,15 @@
     font-style:italic;
     font-size:12px;
 }
+
+.moduleGraph span {
+    display:none;
+    position:absolute;
+}
+.moduleGraph:hover span {
+    display:block;
+    margin: -100px 0 0 100px;
+    z-index: 1;
+}
+
+