sidebar

source/css/_layout/sidebar/toc_common.styl

@@ -42,7 +42,19 @@
   line-height: 1.2
   border-radius: 4px
   position: relative
+  &:before
+    content: ''
+    position: absolute
+    left: -6px
+    top: 'calc(50% - %s)' % 6px
+    bottom: 'calc(50% - %s)' % 6px
+    width: 2px
+    border-radius: 2px
+    background: $color-theme
+    visibility: hidden
   &:hover
     background: var(--block-hover)
   &.active
     color: var(--theme-highlight) !important
+    &:before
+      visibility: visible

source/css/_layout/sidebar/toc_wiki.styl

@@ -36,10 +36,12 @@
     &:hover
       background: var(--block-hover)
       &:after
-        content: ''
+        content: none
-
   >.toc
     padding: 4px
     background: var(--card)
+    a.toc-link:before
+      left: -2px
+      width: 4px
     a.toc-link:hover
       background: var(--block)