Joomla-logo-css-only is a project mainly written in ..., it's free.
First published at my website on July 29th: https://codepen.io/nightshiftc/pen/kxmrq?css-preprocessor=sass
Joomla!® Logo // CSS Only
The Joomla! logo is a registered trademark of Open Source Matters. I'm not associated with, endorsed, yada-yada-yada by Joomla! or Open Source Matters.
Works great on Mac in Webkit browsers, haven't tested on PC.
Known issues:
It doesn't work in IE. I also have no interest in trying to make it work.
Some browsers have an issue with the rotated child elements inside rotated parent element and therefore thin, white artifact lines are present. One I have a moment, I will actually take a different approach that doesn't require the rotated children inside a rotated parent.