added get_dns_servers_table and fix some errors

src/web/css/settings.css

@@ -118,6 +118,7 @@
 }
 
 table {
+  width: 100%;
   border: 2px solid ;
   border-radius: 10px;
 }
@@ -125,6 +126,7 @@ table {
 thead>tr>th {
   border-bottom: 2px solid;
   padding: 10px;
+  width: 100%;
 }
 
 tbody>tr>th {