How can I change the color of quickbooks, I do not want white or black

Hi there, Murillo. Allow me to share a few things about changing the color for QuickBooks Online (QBO).

Please know that the option to change the color of QBO is currently unavailable.  As of the moment, we can only switch the background to dark mode from the settings. You can also change your browser themes to change the color. However, these changes won't affect your QuickBooks.

That said, I suggest sending feedback to our product developers to request the addition of this feature. Rest assured that they are bound to improve the program's capability to suit your business needs. Here's how:

1. In your QBO account, go to the Gear icon.
2. Then, select Feedback.
3. Next, enter your comments or product suggestions and click Next to submit feedback.

Once submitted, check out our QuickBooks Online Feature Requests page to track the status of your request. 

Moreover, you also want to learn how to change the font color in your sales forms using the Custom form styles. This feature helps you change the font size and the form's color as well. Refer to this article for more information: Customise invoices, estimates, and sales receipts in QuickBooks Online.

Let me know if you have other questions about QuickBooks' display preferences. I'm always here to help. Have a good one!