Appletify

Make sure to also install the following extensions on Marketplace:

Credits to ohitstom and Cali

Transparency (optional)

You can follow the steps below if you want the theme to have translucent sidebars

1. Download Windhawk
2. Install the Spotify Tweaks mod
3. Under settings, disable native frames and title bars and enable Transparent Rendering
4. Download MicaForEveryone
5. Create a new process rule for Spotify and set Backdrop type to Acrylic
6. Turn on Blur from behind and Extend frame into client area if necessary
7. Close and reopen Spotify

Credit to Ingan121