Lovelace Thermostat dark theme issue

[TheZoker]

The thermostat lovelace card has a bug with dark themes:

Fix would be to remove the static background color:

.rs-bg-color {
    background-color: #fff;
}

and instead use the dynamical color:

.rs-bg-color {
    background-color: var(--paper-card-background-color, white);
}

I can't find this variable in the thermostats file, so I'm not sure where this needs to be changed...

[TheZoker]

Closing this, because duplicate of: #1902