I can't speak for other frameworks but tailwind only compiles the classes you actually use at build.
The balance between design & function can be at odds when the mission of the page is not clear.
For consumption, these are awesome, your brain almost relaxes as it's easier than the usual onslaught.
The CSS of the second website is wrong, as it uses 'color' without setting 'background-color'. Assuming anything about the default background color is not possible because it is user-configurable in most browsers.
At least http://motherfuckingwebsite.com remains readable when you change your color settings (the second one is completely unreadable on my browser).
The text was readable as designed on a white-background. CSS that considers accessibility or print friendly is always good to add.
Javascript test?
If it was a javascript that checked for the elements you want to ensure is there that would be neat too, I just wouldn't want it to be just me :)
If the whole point of your website is to brag about code to accomplish reasonable formatting.... can we at least have code formatting? I think I have enough bandwidth to afford some line breaks.
Client side GA????