You can find everything you need for the workshop here.
- Codepen - A web tool for programming HTML, CSS and Javascript pages in the browser.
- Periodic Table of HTML Elements - A list of HTML elements with their common uses
- Mozilla Developer Network - A full HTML and CSS reference
- W3 Schools - Another HTML/CSS reference
- Marksheet.io - An awesome HTML & CSS Tutorial that goes from zero all the way up to SASS.