diff --git a/source/css/_layout/tag-plugins/folders.styl b/source/css/_layout/tag-plugins/folders.styl
index a044bd2..695626a 100644
--- a/source/css/_layout/tag-plugins/folders.styl
+++ b/source/css/_layout/tag-plugins/folders.styl
@@ -21,6 +21,9 @@
     outline: none
     padding: 0.75rem 1rem
     border-bottom: 1px solid var(--theme-border)
+    &:before
+      content: '►'
+      margin-right: 2px
     &:last-child
       border-bottom: none
     >
@@ -49,6 +52,8 @@
   >summary
     color: var(--text-p1)
     background: var(--block-hover)
+    &:before
+      content: '▼'
     &:hover:after
       content: '-'