How Do I Create Multiple Fixed Backgrounds in My CSS File?. Cascading Style Sheets (CSS) level 3, also known as CSS3, introduces multiple background images support. You can list multiple ...

Create a new folder in Drive and share it as “ Public on the web.” Upload your HTML, JS & CSS files to this folder. Open the HTML file & you will see “Preview” button in the toolbar.

Create a second file named "externalGreen.css" that will be accessed when the user selects a hyperlink on the page.