start_button.py

import pygame.font

class Play_button(object):
    def __init__(self, screen, button_text):
        self.screen = screen
        self.screen_rect = screen.get_rect()
        self.width = 250
        self.height = 100
        self.button_color = 0, 200, 150
        self.text_color = 255, 255, 255
        self.font = pygame.font.Font(None, 52)
        self.rect = pygame.Rect(0, 0, self.width, self.height)
        self.rect.center = self.screen_rect.center
        self.setup_message(button_text)

    def setup_message(self, button_text):
        self.image_message = self.font.render(button_text, True, self.text_color)
        self.image_message_rect = self.image_message.get_rect()
        self.image_message_rect.center = self.rect.center

    def draw_button(self):
        self.screen.fill(self.button_color, self.rect)
        self.screen.blit(self.image_message, self.image_message_rect)