I took a screenshot of the image on the homepage of home-assistant.io. It shows the temperature in a card with a neat graph in it. I have also seen this card in screenshots of the dashboard of others, but I cannot for the life of me find which card this is… Since it is on the homepage of HA itself, it must be a standard card-type I assume.
custom:mini-graph-card
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It’s a core sensor card.
Thanks! I have no idea why I did not find that one earlier, but typing sensor in the card-types brought it right up!