I've merged some open pull requests from the original Pico repository, and then added a few more enhancements that I either needed for a project (timeline) or wanted to make the building process of websites easier (:user-valid "validation", using <label> within groups, .row & .row-fluid and the .col-* classes like Bootstrap, .align-* and more.) The demo docs here is the main enhanced that have been added to the Pico CSS 2.0.6 branch, for more docs, refer to the original Pico CSS docs.
(OPTIONAL) Some of the demos on this page do require Vanilla JavaScript Files to work the same as the preview here. I may get a build script going to compile the javascript plugins / components later. Let me know if this feature would help you.
Tooltip
For multi-line tooltips, you can now add 
 where the line break should go within your tooltip area.
I also wanted to remove the dotted line on input fileds when they are contained within the tooltip element, so that is why this example has the input field with the tooltip on the <label> wrapper.
data-tooltip="this is 
 a test"
Group
Rows
Similar to Bootstrap 5.3.3, with the responsive .col-*COL#*, .col-*BREAKPOINT*-*COL#*, .offset-*COL#*, .offset-*BREAKPOINT*-*COL#*.
.row has a max width set to the viewport of your xl viewport (1300px by default)
.row-fluid max width is 100%.
col-3
col-6
col-3
col-3 offset-1
col-2
col-2
col-3
col-3
col-3
col-3
col-3
col-2
col-8
col-2
col-5
col-7
col-9
col-3
Columns with offsets defined by breakpoints
When defining multiple .col-*-* on the same element, the order your put the classes on the element matter.
You can add .align-start (default), .align-center or .align-end to your .row or .row-fluid element to align the containing elements to the top, middle, or bottom.
col-4
col-4
-md- Breakpoints
col-12, col-md-4
col-12, col-md-4
col-12, col-md-4
Modal
Notificaton
Accordions
Accordion 1
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque urna diam,
tincidunt nec porta sed, auctor id velit. Etiam venenatis nisl ut orci consequat, vitae
tempus quam commodo. Nulla non mauris ipsum. Aliquam eu posuere orci. Nulla convallis
lectus rutrum quam hendrerit, in facilisis elit sollicitudin. Mauris pulvinar pulvinar
mi, dictum tristique elit auctor quis. Maecenas ac ipsum ultrices, porta turpis sit
amet, congue turpis.
Accordion 2
Vestibulum id elit quis massa interdum sodales.
Nunc quis eros vel odio pretium tincidunt nec quis neque.
Quisque sed eros non eros ornare elementum.
Cras sed libero aliquet, porta dolor quis, dapibus ipsum.
Lorem ipsum dolor sit amet, quo ei simul congue exerci, ad nec admodum perfecto mnesarchum, vim ea mazim fierent detracto. Ea quis iuvaret expetendis his, te elit voluptua dignissim per, habeo iusto primis ea eam.
2016
Lorem ipsum dolor sit amet, quo ei simul congue exerci, ad nec admodum perfecto mnesarchum, vim ea mazim fierent detracto. Ea quis iuvaret expetendis his, te elit voluptua dignissim per, habeo iusto primis ea eam.
2015
Lorem ipsum dolor sit amet, quo ei simul congue exerci, ad nec admodum perfecto mnesarchum, vim ea mazim fierent detracto. Ea quis iuvaret expetendis his, te elit voluptua dignissim per, habeo iusto primis ea eam.
2012
Lorem ipsum dolor sit amet, quo ei simul congue exerci, ad nec admodum perfecto mnesarchum, vim ea mazim fierent detracto. Ea quis iuvaret expetendis his, te elit voluptua dignissim per, habeo iusto primis ea eam.