Install Flat-Remix theme

Requires gnome-tweaks

sudo dnf install gnome-tweaks
git clone https://github.com/daniruiz/flat-remix
git clone https://github.com/daniruiz/flat-remix-gtk
mkdir -p ~/.icons && mkdir -p ~/.themes
cp -r flat-remix/Flat-Remix* ~/.icons/ && cp -r flat-remix-gtk/Flat-Remix-GTK* ~/.themes/

At gnome-tweaks, change theme