Fix article-alt header

This was misaligned.

Author: MikeMcQuaid

_layouts/article-alt.html

@@ -4,7 +4,7 @@
 
 {% include nav.html %}
 
-<header class="bg-gray-light">
+<header class="article-alt-header bg-gray-light">
   <div class="container-lg p-responsive mx-auto">
     <h1 class="alt-h1 lh-condensed text-center my-6 py-md-6">{{ page.title }}</h1>
     <p class="lead text-center text-gray col-md-8 mx-auto mb-4 position-relative">{{ page.description }}</p>

assets/css/covers.scss

@@ -13,6 +13,10 @@
   }
 }
 
+.article-alt-header {
+  margin: -40px 0;
+}
+
 .guide-cover-img {
   height: 200px;