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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Depending on your theme's colors, you may end up with accessibility issues due to insufficient contrast between your background colors and the text color for the initials. You can either be cognizant of the contrast issue when selecting your potential background colors, or you can deal with the issue programmatically by using a library like color to validate that there's enough contrast between your background and font colors, and altering one or the other until an acceptable level is reached.