i wanna change my background color to black

i have also the similar problem but i wanna change my background color to black bcz i have some different ideas for article can you guys plz guide me how to apply it on my work i have no idea about it before.

I checked your account. Unfortunately, I could not find any form you've created. Can I gently ask you what form you are working on? You can give us the form ID. Please follow this related guide: Where to Find My Form URL?

Although I do not know your exact problem, I can recommend you our Themes or Color Schemes. Please click the Form Designer icon on the right and change the Color Scheme under the Colors tab or change the theme under the Themes tab.

I hope this will help you. Please let us know if you require any further assistance.