Uhm... no.

When the first example I open up has this:

<hgroup>
  <h1>Pico</h1>
  <h2>A starter example with all elements and components used in Pico design system.</h2>
</hgroup>

Just… no. A tag that proved the WhatWG wasn’t qualified to create HTML 4’s successor, an H2 inside it showing they don’t know what an H2 even means, etc, etc..

Gets worse from there, like the abuse of details/summary that is broken here for me in Vivaldi for the menu and causes an utter shit-show on my braille reader.

I will say it at least TRIED, but like most framework crap they don’t know enough HTML to be applying CSS to it.