import tkinter as tk
from tkinter import ttk

class gift_wrapping_tool(tk.Tk):
def init (self,*args,**kwargs):
tk.Tk.init(self,*args,**kwargs)
container = tk.Frame(self,bg=”#222448″)

    container.place(width=500,height=500)
    
    
    self.frames = {}
    
    for F in (FirstPage, PageOne,PageTwo,PageThree):
        
        frame = F(container, self)
        self.frames[F] = frame
        frame.place(width=500, height=500)
        frame.grid(row=0,column=0,sticky="nsew")
    
    self.show_frame(FirstPage)

def show_frame(self,cont):
    frame = self.frames[cont]
    frame.tkraise()
    
    

class FirstPage (tk.Frame):

def __init__(self,parent,controller):
    tk.Frame.__init__(self,parent,bg="#222448")
    label = ttk.Label(self,text=" Enter dimensions page:",foreground="light cyan", background="#222448")
    label.place(x=10,y=10)
    
    var1 = tk.StringVar(self) 
    radiobtn1= tk.Radiobutton(self, text="Cuboid", variable=var1, value="Cuboid",bg='light cyan',width=10)
    radiobtn1.place(x=10,y=320)
    
    radiobtn2= tk.Radiobutton(self, text="Cube", variable=var1, value="Cube",bg='light cyan',width=10)
    radiobtn2.place(x=10,y=350) 
    
    radiobtn3= tk.Radiobutton(self, text="Cylinder", variable=var1, value="Cylinder",bg='light cyan',width=10)
    radiobtn3.place(x=10,y=370)
    
    labela= ttk.Label(self, text="Select shape:",background='#222448',foreground='light cyan',width=13)
    labela.place(x=10,y=300)
    
    button1= tk.Button(self,text="Next", bg="#54527E", fg='light cyan',command= lambda: controller.show_frame(PageOne))
    button1.place(x=400,y=400)
    
    
    
    canvas = tk.Canvas(self,bg="#222448")
    canvas.place(x=500,y=500)
    
    
    
    
    

class PageOne(tk.Frame):

    def __init__ (self, parent, controller):
        tk.Frame.__init__(self,parent,bg="#222448")
        label = ttk.Label(self,text="Select pattern page:",foreground="light cyan", background="#222448")
        label.place(x=10,y=10)
        
        button2= tk.Button(self,text="Back",bg="#54527E", fg='light cyan',command= lambda: controller.show_frame(FirstPage))
        button2.place(x=10,y=400)
        
        button2a= tk.Button(self,text="Next to booking",bg="#54527E", fg='light cyan',command= lambda: controller.show_frame(PageTwo))
        button2a.place(x=400,y=400)
        
        canvas = tk.Canvas(self,bg="#222448")
        canvas.place(x=500,y=500)
        

class PageTwo(tk.Frame):

    def __init__ (self, parent, controller):
        tk.Frame.__init__(self,parent,bg="#222448")
        label = ttk.Label(self,text="Select booking slots page:",foreground="light cyan", background="#222448")
        label.place(x=10,y=10)
        
        button3= tk.Button(self,text="Back to first page" ,bg="#54527E", fg='light cyan',command= lambda: controller.show_frame(FirstPage))
        button3.place(x=10,y=400)
        
        button4= tk.Button(self,text="Back to pattern",bg="#54527E", fg='light cyan',command= lambda: controller.show_frame(PageOne))
        button4.place(x=10,y=380)
        
        button4a= tk.Button(self,text="Next to cost",bg="#54527E", fg='light cyan',command= lambda: controller.show_frame(PageThree))
        button4a.place(x=400,y=400)
        
        canvas = tk.Canvas(self,bg="#222448")
        canvas.place(x=500,y=500)

class PageThree(tk.Frame):

    def __init__ (self, parent, controller):
        tk.Frame.__init__(self,parent,bg="#222448")
        label = ttk.Label(self,text="Cost calculation:",foreground="light cyan", background="#222448")
        label.place(x=10,y=10)
        
        button5= tk.Button(self,text="Back to booking",bg="#54527E", fg='light cyan',command= lambda: controller.show_frame(PageTwo))
        button5.place(x=10,y=400)
        
        canvas = tk.Canvas(self,bg="#222448")
        canvas.place(x=500,y=500)
        
        
        
    

app= gift_wrapping_tool()
app.mainloop()

I replaced the pack() with place() and comes up blank