To change the styles in your web form, go to Settings and Web Forms in the sidebar and select Styling.
Scroll down and mark Use Global CSS.
Then, go to Settings in the second sidebar and select Global CSS. You will see the styles of your form and you can change it from there.
For example, you can change the background color by rewriting the value next to background-color:
When you finish the customization, press Save changes and Publish.
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