Active CSS Code Editor
This is all the source code for the code editor used on this site.
The github repo where the files can be downloaded can be found here: https://github.com/Active-CSS/active-css-code-editor-component
Please note that the CSS in the code editor cannot itself be changed in here by using the code editor. This is because the CSS for the code editor is loaded by a file link, rather than by using embedded content. If you ever wanted to deploy this code editor yourself then you would simply edit the CSS file from the repo to match the aesthetics of your website.
The main reason this component is being displayed inside itself here is so that you can see the code involved in building a component like this.