Use sub class

Author: Blendify

sass/_theme_rst.sass

@@ -311,7 +311,7 @@
     border-radius: $base-line-height / 6
     padding: $base-line-height / 10 $base-line-height / 4
     margin: auto $base-line-height / 12
-  .versionmodified, .versionmodified, .versionmodified
+  .versionadded.versionmodified, .versionchanged.versionmodified, .deprecated.versionmodified
     font-style: italic