Use l-box instead of margin

src/views/search.ecr

@@ -6,7 +6,7 @@
 <div class="pure-g">
 <% slice.each do |video| %>
     <div class="pure-u-1 pure-u-md-1-4">
-        <div style="margin:1em;">
+        <div class="l-box">
             <a style="width:100%;" href="<%= video["link"] %>">
                 <img style="width:100%;" src="<%= video["thumbnail"] %>"/>
                 <%= video["title"] %>