diff --git a/theme/canvas/style/core.css b/theme/canvas/style/core.css
index 182de85b433..9a3279fc48e 100644
--- a/theme/canvas/style/core.css
+++ b/theme/canvas/style/core.css
@@ -35,8 +35,7 @@ body {
 .errorbox,
 .continuebutton,
 .singlebutton,
-.buttons,
-.singleselect {
+.buttons {
     text-align: center;
     margin: 1em 0;
 }