How can I get rid of the line in my room card? I try to do it with „border: none“ but it changes nothing 
This is the code from this card:
type: custom:stack-in-card
mode: vertical
cards:
- type: custom:stack-in-card
mode: horizontal
cards:
- type: custom:mushroom-entity-card
entity: sensor.wohnzimmer_temperatur
name: Wohnzimmer
icon_type: none
tap_action:
action: navigate
navigation_path: wohnzimmer-mobil
style: |
ha-card {
background-color: rgba(0,0,0,0);
box-shadow: none;
border-style: hidden;
}
- type: custom:mushroom-chips-card
chips:
- type: entity
entity: switch.steckdosen_wohnzimmer
icon: hue:plug-eu
- type: light
entity: light.lichter_wohnzimmer
use_light_color: true
alignment: end
style: |
ha-card {
background-color: rgba(0,0,0,0);
box-shadow: none;
border-style: hidden;
}
- type: custom:mini-graph-card
entities:
- sensor.wohnzimmer_temperatur
show:
state: false
name: false
icon: false
points_per_hour: 1
hours_to_show: 48
line_color: beige
style: |
ha-card {
background-color: rgba(0,0,0,0);
box-shadow: none;
border-style: hidden;
}