further tweaks to text size in explorer

wagtail/wagtailadmin/static/wagtailadmin/css/components/listing.less

@@ -184,15 +184,21 @@ ul.listing{
         color:white;
         background-color:@color-header-bg;
 
-        .title h2{
+        .title{
+            padding-top:1.3em;
+            padding-bottom:1.3em;
+
+            h2{
                 color:white;
-            font-size:1.3em;
+                font-size:1.8em;
+                font-weight:600;
 
                 a:hover{
                     color:white;
                 }
             }
         }
+    }
 
 
     /* specific columns */