import board
import neopixel
import time
from random import randint


num_pixels = 16
pixels = neopixel.NeoPixel(board.GP0, num_pixels)
x = 0
zeit = 1

while True:
    color1 = (randint(70, 255), randint(127, 255), randint(206, 255))
    color2 = (237,28,36)
    pixels[x] = color1
    pixels[(x-1)] = 0
    x = x+1
    time.sleep(zeit)
    if x==16:
      x = 0
      zeit = zeit /2

    if zeit == 0.015625:
      zeit = 1
      pixels.fill(color2)
      time.sleep(3)
      pixels.fill(0)