This might be it? https://github.com/JaniRefsnes/w3css/blob/master/LICENSE https://github.com/JaniRefsnes/w3css/blob/master/LICENSE Based on the github accoun

This might be it? https://github.com/JaniRefsnes/w3css/blob/master/LICENSE https://github.com/JaniRefsnes/w3css/blob/master/LICENSE Based on the github account being similar to the names in https://www.w3schools.com/w3css/4/w3.css https://www.w3schools.com/w3css/4/w3.css, it is likely to be the origin. Edit: https://news.ycombinator.com/item?id=32831880 https://news.ycombinator.com/item?id=32831880, beat me to it by a few seconds!