diff --git a/frontend/app/components/comment/_level/comment_level.scss b/frontend/app/components/comment/_level/comment_level.scss
index eaf43958..c859322d 100644
--- a/frontend/app/components/comment/_level/comment_level.scss
+++ b/frontend/app/components/comment/_level/comment_level.scss
@@ -1,6 +1,6 @@
 .thread > .thread {
   padding-left: 17px;
-  border-left: 1px solid rgba(0, 0, 0, 0.15);
+  border-left: 1px dotted rgba(0, 0, 0, 0.15);
 }
 .thread_level_4 .thread > .thread {
   padding-left: 5px;
diff --git a/frontend/app/components/comment/_theme/_dark/comment_theme_dark.scss b/frontend/app/components/comment/_theme/_dark/comment_theme_dark.scss
index 6977509f..630273a8 100644
--- a/frontend/app/components/comment/_theme/_dark/comment_theme_dark.scss
+++ b/frontend/app/components/comment/_theme/_dark/comment_theme_dark.scss
@@ -99,6 +99,6 @@
   }
 
   & ~ .thread {
-    border-left-color: rgba(255, 255, 255, 0.15);
+    border-left-color: rgba(255, 255, 255, 0.35);
   }
 }