i just remember i found this link with some CSS for myspace93
https://myspace93.github.io/
and i tried to put it in CSS and it worked
so here's quick tutorial
step 0. log in to your acc
step 1 edit your profile
step 2 copy the css that starts with "@" and ends with ")"
example: @import url("a long github url with css.css")
step 3 paste in CSS box
step 4 update your profile
update: here's easier way to copy
https://github.com/myspace93/myspace93.github.io