Step 1: Go to Publish popup.

From your dashboard, click on the Publish button.

Step 2: Customize back in the stock widget.

1. General.

You can change the Font family and Font size.

2. Sign up form.

You can customize the border-radius of the popup, Field border-radius, Heading color, Text color, Button color, and Button background color

If you want a message field, tick on the Enable message field.

3. Fload button.

Tick on the Enable Float button if you want to show a notification popup. Then adjust From top and change Text color, Background color.

4. Advanced CSS.

In this section, you can enter your CSS to customize your popup, button appearance.

Step 3: Save.