Install Sarcastic White

  1. From your desktop, click your profile picture in the top right.
  2. Select Preferences.
  3. Click Themes.
  4. Below Colors, click Create a custom theme.
  5. Paste #161E2F,#F0F0F0,#94B7E1,#171423,#5E82AC,#FEFEFE,#94B7E1,#D9534F,#171423,#FEFEFE in the textfield labelled "Copy and paste these values to share your custom theme with others".


Refer to the Slack documentation for more info on custom themes.