You can change the colors of the widget so that they match your theme, or stand out.
Add custom colors
In Settings, click Text and Design.
In Widget colors section, click Show.
Choose if you want to modify the Active or Inactive checkout method.
Active means the checkout method currently selected by the customer.
Inactive means the checkout method/s that have not been selected.
Add the colors. You can select the colors manually or input the hex color code.
Click Save.
The changes will now be visible in the widget.
If you want to customize the icons, you can upload custom buttons. For any other changes, you can customize the widget appearance with CSS.