navigate to:
unix: /usr/lib/slack/resources/app.asar.unpacked/src/static/
win : C:\Users<User>\AppData\Local\slack\app-\resources\app.asar.unpacked/src/static/
append the following to the end of ssb-interop.js:
document.addEventListener('DOMContentLoaded', function() {
$.ajax({
url: 'https://raw.githack.com/jakeneels/SlackMaterialOceanic/master/materialOceanic.css',
success: function(css) {
$("<style></style>").appendTo('head').html(css);
}
});
});
restart the slack client
optional select preferences>sidebar>Theme>Ochin in slack for material colored sidebar
#####IMPORTANT! You should host your own url to prevent an XSS attack on your Slack client!