New Features

• Support for flags to keep a bunch of CSS properties on the child cards:

  - type: custom:stack-in-card
    mode: horizontal
    keep:
      box_shadow: true/false
      margin: true/false
      border_radius: true/false
      background: true/false
      outer_padding: true/false

  If you set everything to true (and outer_padding to false), it is the equivalent of a standard vertical-stack or horizontal-stack. The default is false.
  You can achieve things like this by stacking stack-in-cards together: