A slightly transparent dark theme for Fcitx5.
git clone https://github.com/goshida/fcitx5-theme-dark-transparent.git
mkdir -p ~/.local/share/fcitx5/themes/
cp -r ./fcitx5-theme-dark-transparent/dark-transparent ~/.local/share/fcitx5/themes/
Set the theme by editing ~/.config/fcitx5/conf/classicui.conf
or using GUI.
Theme=dark-transparent
And restart Fcitx5 using following command or GUI.
fcitx5 -r -d
See LICENSE.