more than 100% height <3, fix #2710 [ci skip]

public/stylesheets/sass/application.sass

@@ -3498,7 +3498,7 @@ a.toggle_selector
   :background-color #eee
   :position absolute
   :width 100%
-  :height 100%
+  :min-height 100%
   :padding 5px
   :border 1px solid #ddd
 
@@ -3522,4 +3522,4 @@ a.toggle_selector
   &:hover
     :opacity 0.85 !important
   &:visible
-    :opacity 0.5
\ No newline at end of file
+    :opacity 0.5