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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
https://www.w3schools.com/css/css_pseudo_elements.asp
Note: As a rule, double colons (::) should be used instead of a single colon (:). This distinguishes pseudo-classes from pseudo-elements. However, since this distinction was not present in older versions of the W3C spec, most browsers support both syntaxes for the original pseudo-elements.
use the fork panel of your solution and run the tests as much as you need
my solution failed on a random test but then I submitted it successfully without any changes
is there a possibility for me to know the test that caused failure?