HI @praxis.rings !
Welcome to the forum!
Did you link your css stylesheet to the html document like mentioned in the directions?
Also, it is best to write code directly into the forum instead of posting pictures. 
When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.
You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.
See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').