Fold-entity-row: section line is wider than card

using this card setup, I have a small issue with the section line being wider than the card (bit difficult to see but the blue line is left and right outside the card):

type: custom:vertical-stack-in-card
cards:
  - type: entities
    entities:
      - device_tracker.epson_printer
      - script.update_epson_cartridge_sensors
  - type: glance
    show_header_toggle: false
    entities:
      - entity: sensor.epson_ink_level_black
        name: Black
      - entity: sensor.epson_ink_level_cyan
        name: Cyan
      - entity: sensor.epson_ink_level_magenta
        name: Magenta
      - entity: sensor.epson_ink_level_yellow
        name: Yellow
      - entity: sensor.epson_ink_level_waste
        name: Waste
  - type: entities
    show_header_toggle: false
    entities:
      - input_number.ink_level
      - automation.printer_ink_alert

  - type: custom:fold-entity-row
    head:
      type: section
      label: Low ink levels
    entities:
      - type: custom:hui-glance-card
        style: |
          ha-card {
            box-shadow: none;
            border-radius: 0px 0px 6px 6px;
            margin-left: -20px;
            background-image: url("/local/devices/epson/official/epson_background.png");
            background-repeat: no-repeat;
            background-size: cover;
          }
        entities:
          - entity: binary_sensor.ink_level_black_threshold
            name: Black
          - entity: binary_sensor.ink_level_cyan_threshold
            name: Cyan
          - entity: binary_sensor.ink_level_magenta_threshold
            name: Magenta
          - entity: binary_sensor.ink_level_yellow_threshold
            name: Yellow
          - entity: binary_sensor.ink_level_waste_threshold
            name: Waste

close-up:

47
Am I doing something wrong in the card config, or should I add styling somehow? If the latter , what would that be?

thanks for having a look!