Revise card layout.

- Instead of capping the width of the card, use a spacer within the
    card to make it expand like before.

  - However, now that the card's width is no longer capped, elements
    within can enlarge the card.

dist/public/assets/site.css

@@ -130,8 +130,6 @@ a.brand {
 .card {
   position: relative;
   display: inline-block;
-  width: 80vw;
-  max-width: 800px;
   margin-top: 4vh;
   padding: 20px 30px 50px;
   background-color: #fff;
@@ -139,6 +137,11 @@ a.brand {
   box-shadow: 0 2px 6px hsla(0, 0%, 0%, 0.2);
 }
 
+.card > .spacer {
+  width: 80vw;
+  max-width: 800px;
+}
+
 .attribution {
   position: absolute;
   z-index: -1;

dist/templates/layout.html.hbs

@@ -13,6 +13,7 @@
       <p><strong>Error</strong>: {{ this }}</p>
       {{/with}}
       {{> @partial-block }}
+      <div class="spacer"></div>
     </div>
     <div class="attribution">
       <p>Hagrid v{{ version }} built from {{ commit }}</p>