Hello,
1) Add the below code to Theme Options > Custom CSS
.template-container .cart-checkout-nav {background-color: #FA9800;color: #fff;}
.template-container .cart-checkout-nav .active {color: #2A3952;}
.template-container .cart-checkout-nav .active:before {background-color: #2A3952;border-color: #2A3952;}
.template-container .cart-checkout-nav a:not(:last-child):after, .cart-checkout-nav a:before {border-color: #fff;}
2) Provide us with WP Dashboard access to your site to check your product and improve the code if it does not work. We can’t check the site now because of the maintenance mode.
Regards