Rotating a rectangle

[CompleteNewb]

Hello, i'm having trouble rotating a rectangle on screen. I'm not a computer science student and I need help because I have been at it for a couple of days.

The goal is to rotate a rectangle around it's top left corner like a sail around a post, but now the white rectangle rotates around it's center in a black square...

Here's my code:

import random, pygame, sys
from pygame.locals import *

Blue = (0,0,255)
Green = (0,255,0)
White = (255,255,255)

pygame.init()
DISPLAYSURF = pygame.display.set_mode((400, 300))
DISPLAYSURF.fill(Blue)
pygame.display.set_caption('Sailing!')

FPS = 30
fpsClock = pygame.time.Clock()

Sail = pygame.Surface([100,10])
Sail.fill(White)

degrees = 0

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

    rotatedSail = pygame.transform.rotozoom(Sail, degrees, 1)
    Sail_rect = Sail.get_rect(topleft =(200,150))
    DISPLAYSURF.blit(rotatedSail, Sail_rect)
    pygame.display.flip()

    fpsClock.tick(FPS)

    degrees += 1

I played around with the code using transform.rotate, draw.rect and I watched youtube videos, but i can't use rotate with draw.rect, i make the image fly off the screen or I just have different version of this problem and I don't want to load an image I want to create a rectangle.

Any help is welcomed
thank you