import urllib
import urllib.request as url
from tkinter import *

master = Tk()
master.geometry("280x36")
master.resizable(False, False)
master.config(bg="#4b4b4b")
master.overrideredirect(True)

master.wm_geometry("-0-40")
master.wm_attributes("-topmost", 1)

connectStatus = Label(bg="#e67e22", fg="#fff", width=29, height=1, text="Pending", font="Bahnscrift 10")
connectStatus.place(x=10,y=8)

closeButton = Button(width=2, bg="#706f6f", fg="#fff", borderwidth=0, text="x", command=master.destroy)
closeButton.place(x=253, y=8)

def displayCheck():
    colorFlash = "#38f789" if callbackAttempt == 1 else "#ff6656"
    connectStatus.config(bg=colorFlash)
    master.after(10, runRefresh)

def runRefresh():
    attemptConnect()
    master.after(2000, displayCheck)

def attemptConnect():
    global callbackAttempt

    try:
        callbackAttempt = 1
        callback = url.urlopen("https://stackoverflow.com", timeout=1)
        connectStatus.config(text="Connection Established", font="Bahnscrift 10", bg="#2ecc71")
        callback.close()

    except urllib.error.URLError:
        connectStatus.config(text="No Connection", bg="#e74c3c", font="Bahnscrift 10")
        callbackAttempt = 0

master.after(5, runRefresh)
master.mainloop()