Fix mobile

Author: aversey

docs/css/custom.css

@@ -176,21 +176,26 @@
 }
 
 /*******************************************************/
-/* Fix header z-index. */
+/* Fix z-index. */
 header.md-header {
+  z-index: 900 !important;
+}
+.md-sidebar {
   z-index: 1000 !important;
 }
 
 /*******************************************************/
 /* Fix spacing in navigation tab. */
-.md-nav__item--nested > .md-nav__link {
-  margin-bottom: .4rem;
-}
-.md-nav__list .md-nav__list .md-nav__list .md-nav__item:first-child > .md-nav__link {
-  margin-top: 0;
-}
-.md-nav__list .md-nav__list .md-nav__list .md-nav__item:last-child > .md-nav__link {
-  margin-bottom: 0;
+@media screen and (min-width: 76.25em) {
+  .md-nav__item--nested > .md-nav__link {
+    margin-bottom: .4rem;
+  }
+  .md-nav__list .md-nav__list .md-nav__list .md-nav__item:first-child > .md-nav__link {
+    margin-top: 0;
+  }
+  .md-nav__list .md-nav__list .md-nav__list .md-nav__item:last-child > .md-nav__link {
+    margin-bottom: 0;
+  }
 }
 
 /*******************************************************/