This is an example of a shopping bag checkout form with the order summary, designed using HTML, CSS, and Bootstrap framework 4. The concept of Lists has been used with UL and LI components. UL element has been used with the child elements of LI to display the breadcrumb items in an orderly manner. The body of the form is given a background color of linear-gradient(110deg, #BBDEFB 60%, #42A5F5 60%). The breadcrumb items are given a font-size of 10px, and a text style as uppercase to automatically convert the text to uppercase. The input text fields take a border value of 1.5px solid #4bb8a9, in a focus event. The 'Purchase' button is given a style set of font-size as 1rem, font color as white, background-color as #4bb8a9, height as 2.8rem, and border-radius as 0.2rem, which takes a background color of #26A69A in a hover event. The 'Add Gift Code' button is given a background-color of #fff, font color of #4bb8a9, border-radius of 0.2rem, and border as 1px solid #4bb8a9, which turns its background color to #4bb8a9, and font color to #fff, in a hover event. Source: