Everyone publishes their own
Every platform of any size now publishes its account of how software should look and behave. Apple has been at it longest, and
Google made the idea popular outside its own walls.
Microsoft rebuilt theirs around a language rather than a component list, and
IBM put working code, design tools and guidelines under one roof.
The pattern is not confined to the platforms either. 
Atlassian publish the same systems their own teams build against, which is the part that makes them worth reading — a design system nobody is forced to use is a style guide.
Every card is padded the same: ten pixels on all four sides, eight between the publisher and the title, four between the title and the description. Those numbers do not move.
The only thing that does change is the width of the hover UI. It has a max width of 300 pixels and adjusts accordingly when the descriptions are wrapped early. Wrapping breaks on whole words, so setting a fixed width would leave some dead space on the right side of certain hover UIs. In the example below, Shopify's description leaves around 40 pixels of dead space compared to Microsoft's. Therefore, it should get a smaller width.
ShopifyPolarisShopify's design system for the merchant experience — a component library alongside guidance on the fundamentals it is built from.Step through the sources below and the only measurement that changes is the one along the bottom.