Replace background styles with utility classes

www/scss/search.scss

@@ -10,12 +10,6 @@
 
 
 // TODO: update search form to use app sub-theme
-#searchform {
-  background: #38431b url(../images/050419.jpg) 50% 50% no-repeat;
-  background-size: cover;
-  text-align: center;
-}
-
 .search-bg {
   background-image: url('../images/search-bg-640.jpg');
 

www/templates/search-form.tpl.php

-<div id="searchform" class="dcf-bleed dcf-p-6">
-  <form action="./" method="get" class="dcf-wrapper">
+<div class="dcf-bleed dcf-wrapper dcf-pt-7 dcf-pb-7 dcf-txt-center dcf-bg-center dcf-bg-no-repeat dcf-bg-cover unl-bg-darker-gray search-bg" id="searchform">
+  <form action="./" method="get">
       <div class="dcf-input-group">
         <input type="text" name="q" id="search_q" aria-label="Search Query" placeholder="e.g., Herbert Husker, Ph.D." />
         <span class="wdn-input-group-btn"><button class="button" type="submit"><span class="wdn-icon-search" aria-hidden="true"></span><span class="dcf-sr-only">Search</span></button></span>