CSS style using color pallet and background image... not sure about it ?

class.php

@@ -73,7 +73,7 @@ class ps4 {
 				$url = $row["thumbnail_url"];
 			}
 		} else {
-			$url = "no-thumbnail.png";
+			$url = "images/no-thumbnail.png";
 		}
 		return $url;
 	}