This tool is the the timers which comes with flipping animation. You can adjust the color of the back panel so that it has changed over time. Or you can use a static color. The 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 is no change in the quality of the displayed drawings when it gets resized.

Demo: https://codecanyon.net/item/resizable-multicolor-countdown/14633953