diff --git a/packages/editor/styles/styles.css b/packages/editor/styles/styles.css
index 301c52c0e..59234251b 100644
--- a/packages/editor/styles/styles.css
+++ b/packages/editor/styles/styles.css
@@ -739,6 +739,10 @@ p > *::selection {
   mask-size: cover;
 }
 
+.simple-checklist > li.checked p {
+  opacity: 0.8;
+}
+
 /* Callout */
 .ProseMirror div.callout {
   padding: 15px;