Some minor improvements on media queries

Change-Id: I1b35607365c9aee0bc692191c1eba5f2cb9918c3
diff --git a/dev/scss/sidebar/sidebar.scss b/dev/scss/sidebar/sidebar.scss
index 9ac6b5f..bb5df9f 100644
--- a/dev/scss/sidebar/sidebar.scss
+++ b/dev/scss/sidebar/sidebar.scss
@@ -10,7 +10,7 @@
   display: block;
   background-color: $dark-green;
   position: fixed;
-  z-index: 7100;
+  z-index: 4000; // Needs to be behind alerts
   color: $nearly-white;
   width: $logo-left-distance;
   top: 0;