Help with spacing of tiles

I am close to a custom lovelace that i’m happy with - i’d like some help with spacing. I want a gap between vertical stacks to reduce clutter. Any idea how i can achieve what im hoping to do? See attached screenshot.

code for left stack is below:

type: vertical-stack
cards:
  - type: custom:button-text-card
    title: Master Bedroom
    icon: phu:rooms-bedroom
  - type: custom:gap-card
  - type: grid
    cards:
      - type: custom:button-card
        tap_action:
          action: toggle
        entity: light.master_bedroom
        icon: phu:shade-rchiileea-v1
        show_state: true
        theme: kibibit
      - type: custom:button-card
        tap_action:
          action: toggle
        entity: light.reading_light_1
        name: Reading - James
        theme: kibibit
        icon: phu:bulbs-filament
        show_state: true
      - type: custom:button-card
        tap_action:
          action: toggle
        entity: light.reading_light_2
        name: Reading - Kate
        icon: phu:bulbs-filament
        theme: kibibit
        show_state: true
  - type: custom:gap-card
    height: 50
  - type: custom:button-text-card
    title: Bedroom 2
    icon: mdi:bed-queen
  - type: custom:gap-card
    height: 50
  - type: grid
    square: true
    cards:
      - type: custom:button-card
        tap_action:
          action: toggle
        entity: light.bedroom_2
        icon: mdi:ceiling-light
        theme: kibibit
        show_state: true
      - type: custom:button-card
        tap_action:
          action: toggle
        entity: switch.bedroom_lamp
        show_state: true
        icon: phu:table-shade
        theme: kibibit
    columns: 2