Slack dark mode (Last update 4.0)

Evaldo Felipe
1 min readJul 18, 2019


If you’re a big fan of dark mode of your Mac and get boring with the withe background on your slack, this guide will help you to give the same colors of your MacOS environment.

Let’s started

First of all, make sure your slack are on the latest version (4.0.0)

Install npx with:

npm install -g npx

Unpack the app.asar with the command :

npx asar extract /Applications/ /Applications/

Copy the content below and add to the end of file:


document.addEventListener(‘DOMContentLoaded’, function() {
url: ‘',
success: function(css) {
let overrides = `
code { background-color: #535353; color: #85c5ff; } /* Change color: to whatever font color you want */
.c-mrkdwn__pre, .c-mrkdwn__quote { background: #535353 !important; background-color: #535353 !important; }
$(“<style></style>”).appendTo(‘head’).html(css + overrides);

After edit the file, pack the app.asar again with the command:

npx asar pack /Applications/ /Applications/

Now you can restart the slack, and enjoy your dark mode 😎



Evaldo Felipe

25, SysAdmin .feat DevOps, workaholic, rato de internet, e várias historias que não podem entrar aqui.