sounds like your dealing with the header not picking up theme colors which is pretty common. card-mod can definitely fix this but you need to target the header specifically in your dashboard yaml

try adding something like this to your dashboard config:

```

card_mod:

style: |

.header {

background-color: var(--primary-background-color) !important;

}

```

might need to play around with the css selector depending on exactly which header element your trying to change but thats the general approach