This is a custom CSS theme for youtube which takes inspiration from the old YouTube design, YouTube Music, and adds a more squared look. This theme is best used with the Chrome extension Comments Sidebar for YouTube which adds the split layout

On Chrome, Install the extension User CSS, go to youtube.com and write this into your custom style:

@import url('https://raw.githubusercontent.com/s7uck/youtube-css/master/style.css');

If it doesn't work just copy and paste the code from the file