So far, you’ve learned about HTML, JavaScript, and React. There’s another component called Cascading Style Sheets (CSS). CSS is responsible for the styles applied to the various HTML elements on the page: color, position, size, layout, mouseover effects, and more. Review this video and walk-through the CSS to better understand these concepts. 

TUTORIAL: W3C Schools CSS Tutorial (~2hrs) 
Walk through this tutorial. Complete all the lessons under CSS Tutorial (“CSS HOME” through “CSS Math Functions”)