Simplify search results summary layout

app/assets/stylesheets/search_results_summary.scss

@@ -1,4 +1,5 @@
 .search-results-summary {
+  @include grid-column-gutter;
   @include full-width-background;
   background: $highlight;
   margin-bottom: $line-height;

app/components/shared/search_results_summary_component.html.erb

@@ -1,6 +1,4 @@
 <div class="search-results-summary">
-  <div class="row">
-    <div class="small-12 column">
   <% if search_terms || advanced_search_terms %>
     <h2><%= t("shared.search_results") %></h2>
     <p>
@@ -12,6 +10,4 @@
   <% else %>
     <%= content %>
   <% end %>
-    </div>
-  </div>
 </div>