import pygame
import sys

# Initialize Pygame
pygame.init()

# Set up the window
width, height = 800, 600
screen = pygame.display.set_mode((width, height))
pygame.display.set_caption("Simple Pygame")

# Colors
WHITE = (255, 255, 255)
BLUE = (0, 0, 255)

# Rectangle properties
rect_width, rect_height = 50, 50
rect_x, rect_y = width // 2 - rect_width // 2, height // 2 - rect_height // 2
rect_speed = 5

# Main game loop
while True:
    # Handle events
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit() 
            sys.exit()

    # Move the rectangle
    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT]:
        rect_x -= rect_speed
    if keys[pygame.K_RIGHT]:
        rect_x += rect_speed
    if keys[pygame.K_UP]:
        rect_y -= rect_speed
    if keys[pygame.K_DOWN]:
        rect_y += rect_speed

    # Fill the screen with white
    screen.fill(WHITE)

    # Draw the rectangle
    pygame.draw.rect(screen, BLUE, (rect_x, rect_y, rect_width, rect_height))

    # Update the display
    pygame.display.flip()

    # Cap the frame rate
    pygame.time.Clock().tick(60)