diff --git a/src/servala/frontend/forms/renderers.py b/src/servala/frontend/forms/renderers.py
index 90ce926..24e412b 100644
--- a/src/servala/frontend/forms/renderers.py
+++ b/src/servala/frontend/forms/renderers.py
@@ -1,4 +1,5 @@
 from django.forms.renderers import TemplatesSetting
+from django.forms.widgets import Textarea
 
 
 def inject_class(f, class_name):
@@ -21,11 +22,22 @@ class VerticalFormRenderer(TemplatesSetting):
             return "form-check-input"
         return "form-control"
 
+    def get_widget_input_type(self, widget):
+        if isinstance(widget, Textarea):
+            return "textarea"
+        return widget.input_type
+
+    def get_field_input_type(self, field):
+        widget = field.field.widget
+        if inner_widget := getattr(widget, "widget", None):
+            widget = inner_widget
+        return self.get_widget_input_type(widget)
+
     def render(self, template_name, context, request=None):
         if field := context.get("field"):
+            input_type = self.get_field_input_type(field)
             field.build_widget_attrs = inject_class(
-                field.build_widget_attrs,
-                self.get_class_names(field.field.widget.input_type),
+                field.build_widget_attrs, self.get_class_names(input_type)
             )
         return super().render(template_name, context, request)