Open your Slack workspace on the browser or desktop app. Go to preferences/themes. Copy/paste one of the bundled color codes below.
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Monokai Plus:
#2D2A2E,#2F2F2F,#19181A,#FFD866,#19181A,#FCFCFA,#A9DC76,#FF6188,#2D2A2E,#FCFCFA -
Monokai Plus Octagon:
#282A3A,#1E1F2B,#161821,#FFD76D,#161821,#EAF2F1,#BAD761,#FF657A,#282A3A,#EAF2F1 -
Monokai Plus Machine:
#273136,#2F2F2F,#161B1E,#FFED72,#161B1E,#F2FFFC,#A2E57B,#FF6D7E,#273136,#F2FFFC -
Monokai Plus Ristretto:
#2C2525,#2F2F2F,#191515,#F9CC6C,#191515,#FFF1F3,#ADDA78,#FD6883,#2C2525,#FFF1F3 -
Monokai Plus Spectrum:
#222222,#2F2F2F,#131313,#FCE566,#131313,#F7F1FF,#7BD88F,#FC618D,#222222,#F7F1FF