Many thanks for your help!

Hello,
I am new here and am building my magic mirror, but I saw online a clock face o love and wanted to change the one on my raspberry.
Hope anyone can help I have bee trying and so far couldn’t change it.
Bellow I leave the link for an example, it is a flip clock and wanted to put a rectangle with rounded edges as a contour.
Link:
https://codepen.io/shshaw/pen/vKzoLL

Many thanks distraído