Separator line distance from sub buttons vary, depending on the number of sub buttons.

[sypie]

Describe the bug
When only one sub button is present in a separator type the distance of the separator is smaller then when multiple sub buttons are present.

To Reproduce
Steps to reproduce the behavior:

1. Create a Bubble card, type Separator
2. Add multiple sub buttons
3. See the difference in distance between the sub button and the separator line

Expected behavior
I expect the disdance between the sub button(s) and the separator line will be the same, no matter how much sub buttons are set up.

Screenshots
To compare 1 and 3 sub buttons: https://imgur.com/a/Ez2kc0o

YAML
Yaml of the one with 3 sub buttons:

type: custom:bubble-card
card_type: separator
name: Media
icon: mdi:multimedia
sub_button:
  - icon: mdi:radio
    state_background: true
    show_background: true
    tap_action:
      action: navigate
      navigation_path: "#radio"
    double_tap_action:
      action: none
    hold_action:
      action: none
  - icon: mdi:bookshelf
    tap_action:
      action: navigate
      navigation_path: /d5369777_music_assistant/ingress
    double_tap_action:
      action: none
    hold_action:
      action: none
  - icon: mdi:pause-circle-outline
    entity: media_player.wiim_amp
    show_attribute: false
    hold_action:
      action: more-info
    tap_action:
      action: call-service
      service: media_player.media_play_pause
      target:
        entity_id: media_player.wiim_amp
styles: |-
  ha-card {
    --bubble-line-background-color: var(--accent-color); !important;
    --bubble-sub-button-background-color: var(--accent-color); !important;}
  }

The one with just one sub button:

type: custom:bubble-card
card_type: separator
name: AppleTV
icon: mdi:apple
sub_button:
  - entity: remote.woonkamer
    icon: mdi:power
    tap_action:
      action: call-service
      service: remote.send_command
      service_data:
        command: suspend
        entity_id: remote.woonkamer
      target: {}
    visibility:
      - condition: state
        entity: media_player.woonkamer
        state_not: standby
  - entity: remote.woonkamer
    icon: mdi:home
    tap_action:
      action: call-service
      service: remote.send_command
      service_data:
        command: home
        entity_id: remote.woonkamer
      target: {}
    visibility:
      - condition: state
        entity: media_player.woonkamer
        state: standby
styles: |-
  ha-card {
    --bubble-line-background-color: var(--accent-color); !important;
  }

Informations (please complete the following information):

• macOS 15.3.1.

• Browser/App: Firefox 135.0

• Bubble Card version: 2.4.0

• Home Assistant version:

• • Core 2025.2.2
• • Supervisor 2025.02.0
• • Operating System 14.2
• • Frontend 20250210.0