diff --git a/src/css/dark-theme.less b/src/css/dark-theme.less
index 96049856d8..f9b98b34c8 100644
--- a/src/css/dark-theme.less
+++ b/src/css/dark-theme.less
@@ -520,7 +520,7 @@ progress[value] {
 	input[type='checkbox'] {
 		&:after {
 			line-height: 1.5em;
-			content: '';
+			content: none;
 			display: inline-block;
 			width: 12px;
 			height: 12px;