A neon green and purple high contrast theme based off the original Arc theme. GPLv3 license. Arc is a flat theme with transparent elements for GTK 3, GTK 2 and GNOME Shell which supports GTK 3 and GTK 2 based desktop environments like GNOME, Unity, Budgie, Pantheon, Xfce, MATE, Cinnamon, etc. Made using oomox.
Get the matching icons in the image - https://www.opendesktop.org/p/1305308/
NeonPanda Firefox theme - https://addons.mozilla.org/en-US/firefox/addon/neonpanda/
Github - https://github.com/mold-resistant/NeonPanda/blob/master/README.md