go up one directory and access the test.html file:
test.html

go up one directory and then into the files directory, and access the blah.html file:
blah.html

go up one directory, then into the images directory, then into the dogs directory, and access the a1.png image:
a1.png

go into the styles directory and access the my_style.css file:
my_style.css

go into the styles directory, then into the dark directory, and access the new.css file:
new.css