[Python] Tutles and stuff: how do i make a border for turtles?

I have a turtle named t and a turtle named to, turtle named t is already resolved as if turtle t touches the border (which was drawn by turtle named d, it will print game over and stuff, but i also need for turtle to, which is a turtle that moves randomly, to always move inside the box drawn by turtle d

i have this code:

from time import sleep
import turtle
import random

s = turtle.Screen()
s.bgcolor('white')
s.setup(500,380)

d=turtle.Turtle()
d.penup()
d.goto(-150,-150)
d.pensize(5)
d.pendown()
d.hideturtle()
for x in range(4):
d.forward(300)
d.left(90)

t = turtle.Turtle()
t.shape('turtle')
t.color('blue')
t.penup()
to = turtle.Turtle()
to.shape('turtle')
to.color('black')
to.penup()


for peepee in range(1, 6):
xcor=[]
ycor=[]
xrandomlist=[]
yrandomlist=[]
if peepee==5:
print("ur now on the final level")
else:
print(f"u r playing level {peepee}.")

t.goto(40,-40)


to.goto(40,40)
t.setheading(180)
to.setheading(180)
to.speed(peepee)

def left():
t.left(90)

def right():
t.left(-90)

def goup():
t.forward(15)
xcor.append(t.xcor())
ycor.append(t.ycor())
def godown():
t.forward(-15)
xcor.append(t.xcor())
ycor.append(t.ycor())

def skadaddle():
if to.distance(t) < 120:
to.setheading(to.towards(t) + 180)
to.forward(30)


def drunkt():
turn=random.choice([90,-90])
to.left(turn)
go=random.choice([-20, 20])
def yoyo():
to.forward(go)
xrandomlist.append(to.xcor())
yrandomlist.append(to.ycor())
yoyo()
skadaddle()

s.onkeypress(left, "Left")
s.onkeypress(right, "Right")
s.onkeypress(goup, "Up")
s.onkeypress(godown, "Down")
s.listen()

while True:
drunkt()
skadaddle()
if t.xcor()>130 or t.xcor()<-130:
print("game over")
s.bye()
sleep(9999)
if t.ycor()>130 or t.ycor()<-130:
print("game over")
s.bye()
sleep(9999)
if t.distance(to)<50:
print(' ')
print("noice")
print(' ')
for x in range(len(xcor)):
t.speed(1)
t.goto(xcor[-1],ycor[-1])
xcor.pop(-1)
ycor.pop(-1)

for x in range(len(xrandomlist)):
to.speed(1)
to.goto(xrandomlist[-1],yrandomlist[-1])
xrandomlist.pop(-1)
yrandomlist.pop(-1)
sleep(2)
break

turtle.done()
s.bye()

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