This is an example of a billing template with a checkout button, designed using CSS, HTML, and Bootstrap framework 4. The user image and font styles are imported to the code using their URLs. The body of the form is given the styles of background-color as #d7dee5, display as grid, and place-items as center. The information card is given the styles of background-color as #ffffff, border-radius as 10px, font-family as 'Manrope', sans-serif, and line-height as 1rem. The user name is displayed with a font-size of 0.9rem and the billing item is displayed with a font color of #bcbbc0. The user image is given a height of 55sspx and a width of 55px. The price is displayed using a font color of purple. The 'Checkout' button is given a font color as white, and a background color as #6f57d3, which changes to #5843af, in a hover event. Source: https://bbbootstrap.com/snippets/bootstrap-billing-template-checkout-button-17853351