Fix author profile links z-index order on small screens

Close #2440

Author: mmistakes

CHANGELOG.md

@@ -4,6 +4,10 @@
 
 - Update smooth-scroll.js to `v16.1.2`. [#2430](https://github.com/mmistakes/minimal-mistakes/issues/2430)
 
+### Bug Fixes
+
+- Fix author profile links `z-index` order on small screens. [#2440](https://github.com/mmistakes/minimal-mistakes/issues/2440)
+
 ## [4.19.0](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.19.0)
 
 ### Enhancements

_sass/minimal-mistakes/_sidebar.scss

@@ -236,7 +236,6 @@
   border: 1px solid $border-color;
   border-radius: $border-radius;
   background: $background-color;
-  z-index: -1;
   box-shadow: 0 2px 4px 0 rgba(#000, 0.16), 0 2px 10px 0 rgba(#000, 0.12);
   cursor: default;
 

docs/_docs/18-history.md

@@ -5,7 +5,7 @@ permalink: /docs/history/
 excerpt: "Change log of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-last_modified_at: 2020-03-11T13:13:31-04:00
+last_modified_at: 2020-03-16T10:33:26-04:00
 toc: false
 ---
 
@@ -15,6 +15,10 @@ toc: false
 
 - Update smooth-scroll.js to `v16.1.2`. [#2430](https://github.com/mmistakes/minimal-mistakes/issues/2430)
 
+### Bug Fixes
+
+- Fix author profile links `z-index` order on small screens. [#2440](https://github.com/mmistakes/minimal-mistakes/issues/2440)
+
 ## [4.19.0](https://github.com/mmistakes/minimal-mistakes/releases/tag/4.19.0)
 
 ### Enhancements