For more information about the Checkout Form, see Customize Shopping Cart Text under the Online Experience section of the User Guide.
To add custom CSS to the current element (which applies to the current element only), you would use the standard Introduction To Advanced Styling functions and features for that specific element.
Change Button Outline Color
To change the color of the button outline (in some cases this will help make the theme styling of the button more obviously clickable).
button.btn-outline-secondary {
font-weight: 600;
color: black;
}
Any suitable web-safe color designation will work. See w3schools.com - HTML Colors for additional references.
(advanced) options may not be supported under all plans.
