How do I change upload button color?

The File Uploader is thoroughly annotated with CSS classes. It's your starting point for deeper customization. You can find a class for every File Uploader item by inspecting its elements or sifting through the File Uploader source code. If you want to change the appearance of an element, you need to override its CSS class. The primary upload button has a CSS class .uploadcare--widget__button_type_open . Changing the background-color property of this class will change the color of the button.

.uploadcare--widget__button_type_open {
  background-color: #16d061;
}