diff --git a/question/type/ddwtos/styles.css b/question/type/ddwtos/styles.css
index 2cc0da5e8ff..721969b0fff 100755
--- a/question/type/ddwtos/styles.css
+++ b/question/type/ddwtos/styles.css
@@ -11,10 +11,6 @@
     margin-bottom: 0.5em;
 }
 
-.que.ddwtos .drop.filled {
-    border: 3px dotted #000000;
-}
-
 .que.ddwtos .drop {
     display: inline-block;
     text-align: center;