I\'m working on a website that uses gulp to compile and browser sync to keep the browser synchronised with my changes.
The gulp task compiles everything
Adding to a long list of answers, this issue also happened to me because I did not realize the path was wrong from a browser-sync point of view.
Given this simple folder structure:
package.json
app
|-index.html
|-styles
|-style.css
the href attribute inside in index.html has to be app/styles/style.css and not styles/style.css