layout/overview.md: fix double copy button.

diff --git a/docs/4.0/layout/overview.md b/docs/4.0/layout/overview.md
index 5a34beebfa7e8986fe3c111ce65d483382af4366..bdc030d3f421971d58c589d7b4f62c5c2c28c64a 100644 (file)
--- a/docs/4.0/layout/overview.md
+++ b/docs/4.0/layout/overview.md
@@ -166,7 +166,7 @@ These higher values start at an arbitrary number, high and specific enough to id
 
 We don't encourage customization of these individual values; should you change one, you likely need to change them all.
 
-```scss
+{% highlight scss %}
 $zindex-dropdown:          1000 !default;
 $zindex-sticky:            1020 !default;
 $zindex-fixed:             1030 !default;
@@ -174,6 +174,6 @@ $zindex-modal-backdrop:    1040 !default;
 $zindex-modal:             1050 !default;
 $zindex-popover:           1060 !default;
 $zindex-tooltip:           1070 !default;
-```
+{% endhighlight %}
 
 To handle overlapping borders within components (e.g., buttons and inputs in input groups), we use low single digit `z-index` values of `1`, `2`, and `3` for default, hover, and active states. On hover/focus/active, we bring a particular element to the forefront with a higher `z-index` value to show their border over the sibling elements.