Main.py consists typo in value for border style by 7 buttons

[LeaDevelop]

b1=Button(win,text="Show all Records",bg="white",fg="brown",border=5,relief="raise",font=("Georgia",13),width=20,
          command=showall)

Official documentation legal values are: "raised", "sunken", "flat", "groove", and "ridge".
https://docs.python.org/3/library/tkinter.html

P.S.

• I volunteer to resolve it :) @uti1man
• Also question is this repo following PEP 8? I could sort some missing whitespaces and blank lines.