diff --git a/form.php b/form.php
index 4e9aafb..8e47b63 100644
--- a/form.php
+++ b/form.php
@@ -35,6 +35,9 @@ class form
   /** The Bootstrap width of the column of fields */
   public $fieldwidth = 10;
 
+  /** Define a class for form object */
+  public $formClass = "form-horizontal";
+
   /** Create a form
     * @param string|null $formName The form name
     */
@@ -142,7 +145,7 @@ class form
     $res = "<form action='#' method='$method'";
     if ($this->formName != "")
       $res .= " id='$this->formName'";
-    $res .= " class='form-horizontal'>\n";
+    $res .= " class='".$this->formClass."'>\n";
     $group = "";
     if (isset ($_SESSION["domframework"]["form"]["values"]))
     {