Materia (formerly Flat-Plat) is a Material Design theme for GNOME/GTK+ based desktop environments.
It supports GTK+ 3, GTK+ 2, GNOME Shell, Budgie, MATE, Unity, LightDM, GDM, Chrome theme, etc.

Also Materia has compatibility with oomox theme designer.

Ripple effect animations for GTK+ 3 are supported:

3 color variants and 2 size variants are available:

Materia	standard	compact
standard
dark
light

Various desktop environments are supported:

• GNOME Shell >=3.18
• Budgie >=10.2.5
• MATE >=1.14
• Unity >=7.4
• ... and more DEs are planned.

Official package (maintained by @isaagar) is available:

sudo apt install materia-gtk-theme

Package is available via PPA (maintained by @igor-dyatlov):

sudo add-apt-repository ppa:dyatlov-igor/materia-theme
sudo apt update
sudo apt install materia-gtk-theme

Package is available via AUR (maintained by @cthbleachbit):

git clone https://aur.archlinux.org/materia-theme.git
cd materia-theme
makepkg -si

Package is available via Copr (maintained by @LaurentTreguier):

sudo dnf copr enable tcg/themes
sudo dnf install materia-theme

3 variants (Materia, Materia-dark, Materia-light) are available via Flathub:

flatpak remote-add flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak install flathub org.gtk.Gtk3theme.Materia
flatpak install flathub org.gtk.Gtk3theme.Materia-dark
flatpak install flathub org.gtk.Gtk3theme.Materia-light

You need to have the following dependencies:

• GTK+ >=3.18
• gnome-themes-standard or gnome-themes-extra — The package name depends on the distro.
• Murrine engine — The package name depends on the distro.
  • gtk-engine-murrine on Arch Linux
  • gtk-murrine-engine on Fedora
  • gtk2-engine-murrine on openSUSE
  • gtk2-engines-murrine on Debian, Ubuntu, etc.

Run the following commands in the terminal:

cd /tmp && wget -qO - https://github.com/nana-4/materia-theme/archive/master.tar.gz | tar xz
cd materia-theme-master
sudo ./install.sh

Note: ./install.sh allows the following options:

-d, --dest DIR           Specify destination directory
-n, --name NAME          Specify theme name
-c, --color VARIANTS...  Specify color variant(s) [standard|dark|light]
-s, --size VARIANT       Specify size variant [standard|compact]

Without any options, Materia will be installed with all variants into /usr/share/themes.
Try ./install.sh --help for more information.

Delete the installed directories:

sudo rm -rf /usr/share/themes/Materia{,-compact,-dark,-dark-compact,-light,-light-compact}

• To properly display the theme, use a font family including Medium weight (e.g. Roboto or M+).
• Set the font size to 9.75 or 10.5 (i.e. 13px or 14px at 96dpi).

To use the Chrome theme;

1. Open the chrome folder on /usr/share/themes/Materia<-variant>.
2. Drag and drop the .crx files into the Chrome/Chromium Extensions page (chrome://extensions).

You can change the GDM (lock/login screen) theme by replacing the default GNOME Shell theme.
See the wiki for details: https://github.com/nana-4/materia-theme/wiki/GDM-Theme

_{Previews Info: Icon Theme: Paper | Font: M+ 1C 9.75pt | Dock's icon size: 48px + fixed | Wallpapers}

Materia allows you to change the color scheme relatively easily. See HACKING.md for details.

If you find bugs or have suggestions, please report it to the issue tracker. Any contribution would be much appreciated.

ToDo list can be found here: TODO.md

Materia is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for details.

• Materia is based on Adwaita by GNOME.
• Design and specifications are based on Google's Material Design.
• The included symbolic icons are based on Material Design icons by Google.
• Chrome/Chromium scrollbars extension was forked from Adwaita-chrome-scrollbar by GNOME Integration Team.
• Yauhen Kirylau (@actionless) who is oomox author polished scripts and supported Materia with oomox.
• @n3oxmind who helped improve the installation script.

Also thank you to all contributors and upstream developers.