First click on the project once and then just hit the keyboard keys ASDFGHJKL. Enjoy it!
I am not really sure what this is but it is really fun to play.
When you hit the corresponding key on your keyboard: 1 - It plays the sound that is associated with that key 2 - A short little animation pops the button up to be a little bigger then also it applies that yellow border.
This small game project was developed with Javascript, CSS and HTML. You can see the source code on my github account Drum Kit