KEY_WIDTH = 40
KEY_HEIGHT = KEY_WIDTH
KEY_SPACING = 4

WINDOW_WIDTH, WINDOW_HEIGHT = 1024, 768

LAYER_BTN_STYLE = "border: 1px solid black; padding: 5px"
ACTIVE_LAYER_BTN_STYLE = "border: 1px solid black; padding: 5px; background-color: black; color: white"