Responsive Design using HTML, CSS and JS

Hey fellow newbies and those who can proudly call themselves coders! This challenge was a real struggle! Took me literally hours figuring things out and then days debugging all issues but I finally made it! All buttons seem to behave the way I want them to now it all looks pretty similar to initial design. Feeling proud and empowered and I haven’t even watched Snyder’s cut yet! 😊 If there’s anyone out there who can look at the code and perhaps point out what I missed or what could have been done in a more efficient way I would very much welcome any feedback!