How can I change the background color?

You can change the background color from the Theme & Appearance menu, which accessible in the Question panel.

The Theme Settings menu with the "Background Color" option highlighted in the "Colors" section.

You can also make the background transparent, or set a background image or video.

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[old]How do I style my form?
Paperform gives you a lot of control over how your form looks and behaves. Here's how you can style and change design elements in your forms.
Can I make my form's background transparent?
You can adjust the transparency of the form colors in the Theme & Appearance editor.
How do I add a background image to my form?
Go to Theme & Appearance → UI Elements → Background → Background Image and upload an image.
Can I have a background video?
You can add a background video to your form under Theme & Appearance → UI Elements → Background.
Can I add GIFs as my background?
Yes, you can natively upload a GIF as your background.