This release includes a change by @SLaks that allows you to use the card without specifying any entity. It's useful if you want to create a timer that's always active or are using a template to parse and fill in the card's state. It's finally possible to use the card with integrations that squish all their timers into one entity, like Google Home, and show all their timers at once.
I've also updated the mushroom styles to be consistent with the latest version of mushroom cards. Enjoy!