Press 'F11', click anywhere on page, put some cool music & just start typing anything! ;-)
Select Background Color:
Black
White
Dark Blue
Gray
Indigo
Select Code Type:
C/C++
HTML/JavaScript
Java
PHP
CSS
Ruby
C#
Codetyper - Clone of HackerTyper.com
Added Features: Change Background Color, Select Code Type!
Fork it - https://github.com/aniketkudale/Ttyper