Inserting my Css page to HTML

[Charles]

I have created a CSS design to insert into my HTML coding, simple enough, but I seem to be having issues planting the CSS into the HTML. I'll give you the details.
The CSS file is called "style.css"
The folder this file is directly stored in is called "Web Stuff"
This is the code I have:
I thought that should work, but it doesn't seem to. I;m sure there a simple solution but I just can't get it working. Anyone point out a probably obvious mistake?

[Dave]

You have a space in your folder name. You can't have that. No spaces are allowed in either file or folder names. Use a _ or - instead.