diff --git a/src/components/DefElement.vue b/src/components/DefElement.vue
index 3483ee7f964619f08b9ef7d3fd2d24a0dc8aa3be..8d7f1b7ef379048fbbc235c95330fb3bbcb7b6a8 100644
--- a/src/components/DefElement.vue
+++ b/src/components/DefElement.vue
@@ -76,7 +76,7 @@ export default {
 }
 
 mark {
-  background: #ffffff;
+  background: rgba(255, 255, 255, 0);
 }
 
 span.language {