Show icons only when cursor is over the box.

git-svn-id: http://svn.redmine.org/redmine/trunk@16408 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/stylesheets/application.css

@@ -1125,6 +1125,9 @@ div.wiki img {vertical-align:middle; max-width:100%;}
   line-height:1.5em;
 }
 
+.mypage-box>.contextual {opacity:0; transition: opacity 0.2s;}
+.mypage-box:hover>.contextual {opacity:1;}
+
 .handle {cursor: move;}
 
 #my-page .list th.checkbox, #my-page .list td.checkbox {display:none;}