Icons for upshifting and downshifting are not visible in the simple thermostat


after the update to the HA version 2021.11 the icons for switching the temperature up and down are not visible. I can click on them with the mouse if I know where the ICONS are and it works, but they are not visible.
Even an update to 2021.11.1 brought no change.


ups…found this:

HA 2021.11b1: Arrows not any more visible · Issue #282 · nervetattoo/simple-thermostat (github.com)