A place to store .css for custom slack styling that can be served up via http
(This will need to be redone after every slack update.)
Append the following code snippet to C:\Users\<username>\AppData\Local\slack\app-3.0.0\resources\app.asar.unpacked/src/static/ssb-interop.js:
document.addEventListener('DOMContentLoaded', function() {
$.ajax({
url: 'https://raw.githubusercontent.com/jon-is-learning/slack/master/darkSlack.css',
success: function(css) {
$("<style></style>").appendTo('head').html(css);
}
});
});