# Slack Dark Theme
As many of you who follow what I do will know, I like things dark. I don't like the white glare of a computer screen.
I am sure at least some of you use [Slack](http://www.slack.com) for your work communications? If not I strongly recommend you check it out.
The only down-side is it doesn't yet have a dark theme. So looking around the internet I found plenty of ways to do it by just editing the [Electron](https://electron.atom.io/) app javascript files and injecting a custom css sheet.
So, in order to do this now before Slack officially supports it, do the following:
- Press Ctrl + R to open `Run...` in Windows
- Type `%LOCALAPPDATA%` and press Enter to open your current users `AppData` folder, such as `C:\Users\luke\AppData\Local`
- Go into `slack\app-2.x.x\resources\app.asar.unpacked\src\static` and open the **ssb-interop.js** file
- Add the following to the end of the **ssb-interop.js** file
```
document.addEventListener("DOMContentLoaded", function() {
// Then get its webviews
let webviews = document.querySelectorAll(".TeamView webview");
// Fetch our CSS in parallel ahead of time
const cssPath = 'https://raw.githubusercontent.com/angelsix/youtube/develop/Windows%2010%20Dark%20Theme/Slack/slack-dark.css';
let cssPromise = fetch(cssPath).then(response => response.text());
// Insert a style tag into the wrapper view
cssPromise.then(css => {
let s = document.createElement('style');
s.type = 'text/css';
s.innerHTML = css;
document.head.appendChild(s);
});
// Wait for each webview to load
webviews.forEach(webview => {
webview.addEventListener('ipc-message', message => {
if (message.channel == 'didFinishLoading')
// Finally add the CSS into the webview
cssPromise.then(css => {
let script = `
let s = document.createElement('style');
s.type = 'text/css';
s.id = 'slack-custom-css';
s.innerHTML = \`${css}\`;
document.head.appendChild(s);
`
webview.executeJavaScript(script);
})
});
});
});
```
- Now close Slack (including in the Taskbar)
- Restart Slack to see the lovely new dark theme :smiley:
