Would be great to be able to set the size of horizontal cards as not all cards deserve equal sizing. Some work better with smaller space.
For example, specifying sizing either in percentages or as fractions:
type: horizontal-stack
size:
- 2/3
- 1/3
cards:
- type: mini-graph
entity: sensor.aqi
- type: bar-card
entity: sensor.allergens
Here is a different visual example of varying sizes within a horizontal card.