Font no longer works after lesson-5

I noticed that when I switch to branch level-6 the font no longer works. I checked the differences and you seem to have changed the format from "truetype" to "tff" which is not a valid format. "truetype" is correct. Also, the ending semicolon is changed to a comma which breaks it. So after level 5, line 50 of style.css becomes

` src: url("assets/fonts/Rubik-Regular.ttf") format("ttf"),`

when it needs to stay

` src: url("assets/fonts/Rubik-Regular.ttf") format("truetype");`

I submitted pull requests fixing the affected branches.

Start with line 50 of style.css on the level-6 and affected branches, comparing the font declaration with the issue's expected values. Done means the Rubik font uses format("truetype") and ends with a semicolon, and the font works after lesson 5.

Written by the indexing model from the issue text.