Coveo: Add styling

Author: lamATnginx

layouts/partials/header.html

@@ -23,7 +23,7 @@
               <!-- Detached search box -->
               <atomic-external selector="#search-v2" id="search-standalone-header">
                 {{ $redirectUrl := default .Site.Params.coveo_search_redirect "/search.html" }}
-                <atomic-search-box redirection-url={{ $redirectUrl }}></atomic-search-box>
+                <atomic-search-box redirection-url={{ $redirectUrl }} class="header-search-box"></atomic-search-box>
               </atomic-external>
             {{ else }}
               <!-- Standalone search box. -->
@@ -47,7 +47,7 @@
       <!-- Detached search box -->
       <atomic-external selector="#search-v2">
         {{ $redirectUrl := default .Site.Params.coveo_search_redirect "/search.html" }}
-        <atomic-search-box redirection-url={{ $redirectUrl }}></atomic-search-box>
+        <atomic-search-box redirection-url={{ $redirectUrl }} class="header-search-box"></atomic-search-box>
       </atomic-external>
     {{ else }}
       <!-- Standalone search box. -->