def rgb(color='white'):
    """
    Given color name, returns its RGB values.
    
    :param color: string with color name
    :return: r, g, b values
    """
    r, g, b = 1, 1, 1
    
    if color == 'red':
        r, g, b = 1, 0, 0    
    elif color == 'green':
        r, g, b = 0, 1, 0 
    elif color == 'blue':
        r, g, b = 0, 0, 1
    elif color == 'green0':
        r, g, b = 0.6, 0.8, 0.3
    elif color == 'green1':
        r, g, b = 0, 0.4, 0.4
    elif color == 'blue0':
        r, g, b = 0.1, 0.6, 0.8
    elif color == 'blue1':
        r, g, b = 0.1, 0.4, 0.5
    elif color == 'dark-blue':
        r, g, b = 0.06, 0.26, 0.37
    elif color == 'light-blue':
        r, g, b = 0.2, 0.71, 1
    elif color == 'pale-blue':
        r, g, b = 0.85, 0.95, 0.96
    elif color == 'yellow':
        r, g, b = 1, 1, 0
    elif color == 'gray0':
        r, g, b = 0.5, 0.5, 0.5
    elif color == 'gray':
        r, g, b = 0.85, 0.85, 0.85
    elif color == 'dark':
        r, g, b = 0.35, 0.35, 0.35
    elif color == 'violet':
        r, g, b = 0.8, 0.2, 0.6
    elif color == 'purple':
        r, g, b = 0.76, 0.48, 0.63
    elif color == 'green-blue':
        r, g, b = 0.1, 0.57, 0.6

    return r, g, b