diff --git a/packages/client/src/components/MkNoteDetailed.vue b/packages/client/src/components/MkNoteDetailed.vue
index 600a42494f..55bae467cd 100644
--- a/packages/client/src/components/MkNoteDetailed.vue
+++ b/packages/client/src/components/MkNoteDetailed.vue
@@ -630,6 +630,9 @@ onUnmounted(() => {
 		}
 	}
 
+	&.max-width_500px {
+		font-size: 0.9em;
+	}
 	&.max-width_450px {
 		> .reply-to:first-child {
 			padding-top: 14px;