Exercise 1/10 told us: "The file main.css has the CSS rules that style the HTML in index.html.", but I bet you were in a hurry to get to the fun part and just clicked on Submit without taking time to figure out what that meant!
This is one of those things that is easy to miss the first time and then after that you wonder why you didn't see it.
- In the centre of the page, in the editing area, the place with the black background where you can see lots of code in different colours.
- Look just above line 1, see where it says index.html? That is where all of your HTML code is going to go.
- Look just to the right of index.html, see where it says main.css? Click on main.css and you will be in the tab/page where you will be writing your CSS rules.
location of main.css tab