perfect vertical toc alignement

assets/sass/_theme/design-system/table_of_contents.sass

@@ -30,7 +30,7 @@
             padding: calc((var(--header-height)) / 2 - #{$body-size}) $grid-gutter
             padding-top: 0
             padding-bottom: 0
-            line-height: var(--header-height)
+            line-height: calc(var(--header-height) - 1px)
 
     .toc
         flex: 1