How do I change the widget button color?

Changing the button color is one of the most common cases. It can be easily done by overriding the CSS classes of the button element.

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

.uploadcare--widget__button_type_open:hover {
  background-color: #15c25a;
}

Check out the live demo.