Merge branch 'master' into linenos

_includes/vendor/anchor_headings.html

@@ -64,7 +64,7 @@
     {% capture anchor %}{% endcapture %}
 
     {% if html_id and headerLevel >= minHeader and headerLevel <= maxHeader %}
-      {% capture anchor %}href="#{{ html_id}}"{% endcapture %}
+      {% capture anchor %}href="#{{ html_id}}" aria-labelledby="{{ html_id}}"{% endcapture %}
 
       {% if include.anchorClass %}
         {% capture anchor %}{{ anchor }} class="{{ include.anchorClass }}"{% endcapture %}

_sass/search.scss

@@ -308,6 +308,8 @@
   @include mq(md) {
     .main {
       position: fixed;
+      right: 0;
+      left: 0;
     }
   }