Fix error page css

assets/stylesheets/components/_page.scss

@@ -5,7 +5,7 @@
 ._page {
   position: relative;
 
-  ._page-error { position: static; }
+  &._page-error { position: static; }
 
   > h1 { @extend ._lined-heading; }
   > h1:first-child { margin-top: 0; }