Fix CSS regression: color some of the tags white (for gray bg)

h/css/common.scss

@@ -1073,6 +1073,15 @@ pre {outline: 1px solid #ccc; padding: 5px; margin: 5px; }
   overflow: hidden;
 }
 
+// Specific rules for tags on the displayer page
+.gray-tags .tags {
+  // Make tags white (on gray bg)
+  li { background: white; }
+
+  // Don't show the stub of the editor
+  li.tagit-new { display: none; }
+}
+
 h3.tagstream, h3.userstream {
   letter-spacing: normal;
   word-spacing: normal;