---
title: "Add Custom CSS - Convert Forms"
description: "The Form Builder offers a way to inject your own Custom CSS with the option to also add your own Class Suffix.   	   	 		Go to Components -&"
url: "https://www.tassos.gr/docs/convert-forms/functionality/custom-css"
date: "2026-11-09T17:34:15+00:00"
language: "en-GB"
---

[ Home ](https://www.tassos.gr/docs) / [ Convert Forms ](https://www.tassos.gr/docs/convert-forms) / [ How-to ](https://www.tassos.gr/docs/convert-forms/functionality)

#  Add Custom CSS

 The Form Builder offers a way to inject your own Custom CSS with the option to also add your own Class Suffix.

 ![convert forms custom css](https://www.tassos.gr/images/convert-forms-custom-css.png)

- Go to **Components → Convert Forms → Forms** and click **New**.
- Choose a form template or create a new one from scratch.
- In the form builder, open the **Design** tab and expand the **Advanced** panel.
- Add your CSS rules in the **Custom CSS** option.

 Optionally, add a **Class Suffix** (same panel) so you can target this form in your CSS without editing your template's stylesheet.

 ![convert forms custom css class](https://www.tassos.gr/images/convert-forms-custom-css-class.png)

 Last updated on Nov 9th 2026 14:11