TODO

Listen for keyboard events in addition to button click.
End game modal with Try Again button.
Read words in from file or internet.
Move on to next word if user chooses Try Again.

Done

Three components: header, grid, keyboard.
Grid and keyboard colors depend on whether matched or not.
Keyboard button with onClick.
Three types of input: Enter, Del, and character.
Accept Enter key only at end of row.
End game - win or lose. Stop accepting input. Don't increment row.
Make display: grid for 5x6 grid.
Box shadow for keyboard keys.