Prevents header anchors from interfering with clickable content.

_css/react.scss

@@ -80,6 +80,7 @@ h1, h2, h3, h4, h5, h6 {
   &.anchor {
     position: relative;
     top: -$navHeight;
+    z-index: -1;
     > a {
       color: $darkTextColor;
       position: relative;