Whenever I need a function that i know has been done a million times before but for some reason isnt on stack overflow ill use copilot E.g. converting default

Whenever I need a function that i know has been done a million times before but for some reason isnt on stack overflow ill use copilot E.g. converting default EM value and REM value to pixels Like i couldnt seem to google what the default EM and REM values were but copilot knows better than me