Add styling to search bar on empty home page

src/invidious/views/empty.ecr

@@ -3,16 +3,17 @@
 <title>
     Invidious
 </title>
+<link rel="stylesheet" href="/css/empty.css?v=<%= ASSET_COMMIT %>">
 <% end %>
 
 <%= rendered "components/feed_menu" %>
 
-<div class="pure-g h-box">
-    <div class="pure-u-1">
+<div class="pure-g h-box" id="search-widget">
+    <div class="pure-u-1" id="logo">
         <h1 href="/" class="pure-menu-heading">Invidious</h1>
     </div>
     <div class="pure-u-1-4"></div>
-    <div class="pure-u-1-2 searchbar">
+    <div class="pure-u-1 pure-u-md-12-24 searchbar">
         <form class="pure-form" action="/search" method="get">
             <fieldset>
                 <input type="search" style="width:100%" name="q" placeholder="<%= translate(locale, "search") %>" value="<%= env.get?("search").try {|x| HTML.escape(x.as(String)) } %>">