Help with "Not allowed to load local resource: file"

Hello!
I am attempting to load a Bootstrap theme into my project. I found the theme on Colorlib and downloaded it. I attempted to include it in my HTML file but then received this message,
Not allowed to load local resource: file:///C:/Users/danal/Documents/comport.min.css.

I did Google this and on stack overflow they started talking about servers and ASP.net, etc. . .they lost me. I am working on this project on Github Pages. Any guidance would be appreciated!

Here is my code in CodePen:

https://codepen.io/CodeDuchess/pen/zXWMLK

Thanks!!!

Dana