https://www.codegrape.com/item/royaltimer-multicolor-countdown-timer/11301

RoyalTimer comes with flipping animation. You can adjust the flip background color so that it changes over time, or you can use a static background color. Colors are set to digits, the rear panel and signatures. It uses vector data to draw the digits and the panels of the countdown. There isn't change in the quality of the displayed drawings when it gets resized.