Testing all your CSS breakpoints
This is a very simple test to easily identify all the CSS breakpoints on a page. This is a handy way to visually check your breakpoints.
Save the test-breakpoints.scss file into your current project, and then import it into your main SCSS file.
@import 'test-breakpoints';
You should now have a block in the top left hand corner of the page telling you which breakpoint you are currently at.