It's a simple web application to record your screen. The best part about it is that you can use it as a web application from HERE. To record the system audio I recommend to use Edge, Chrome or Opera.
Optionally, you can create your own build for any platform you prefer using Nativefier. However, I don't recommend this option because it might prevent you from recording desktop audio in a desktop application.
If you are looking for a more advanced recorder with different encoders, file formats, bitrates, FPS settings, and a monitor selector, you can explore my other project (available only for Windows).
Thanks to Flaticon for the icon and dhruv479 for give me the idea to create this.