diff --git a/AlgebraicDataflowArchitectureModel/src/simulator/interfaces/html/HtmlElement.java b/AlgebraicDataflowArchitectureModel/src/simulator/interfaces/html/HtmlElement.java
index a1264f4..9696e1f 100644
--- a/AlgebraicDataflowArchitectureModel/src/simulator/interfaces/html/HtmlElement.java
+++ b/AlgebraicDataflowArchitectureModel/src/simulator/interfaces/html/HtmlElement.java
@@ -52,7 +52,7 @@
 			stylesMap.insert(prop, new Constant(styles.get(prop)));
 		}
 		res.insert("\"styles\"", stylesMap);
-		String classTmp = String.join(" ", classes);
+		String classTmp = "\"" + String.join(" ", classes) + "\"";
 		res.insert("\"class\"", new Constant(classTmp));
 		return res;
 	}