Different background colour for Window title in the Valo theme

Flow
1

I would like to give a different colour for the Window title in the Valo theme. I tried to change the background colours for:

.v-window-header
.v-window-closebox
.v-window-maximizebox
.v-window-restorebox

However, I still see a small gap (show in the content’s background colour) between the caption text and the buttons
What is the solution?

2

you also need to add .v-window-outerheader this is what worked for me:

    .v-window-header, .v-window-outerheader, .v-window-closebox, .v-window-maximizebox, .v-window-restorebox{
       color: white;
       background-color: black; 
    }
3

Yes, it works.
Thanks