load custom.css file from third_party

application/views/interface_assets/mini_header.php

@@ -18,7 +18,9 @@
     <!-- Maps -->
     <link rel="stylesheet" type="text/css" href="<?php echo base_url(); ?>assets/js/leaflet/leaflet.css" />
 
-    <link rel="icon" href="<?php echo base_url(); ?>/favicon.ico">
+	<?php if (file_exists(APPPATH.'third_party/assets/css/custom.css')) { echo '<link rel="stylesheet" href="'.base_url().'third_party/assets/css/custom.css">'; } ?>
+
+    <link rel="icon" href="<?php echo base_url(); ?>favicon.ico">
 
     <title><?php if(isset($page_title)) { echo $page_title; } ?> - Cloudlog</title>
   </head>