This is the code that resolves the problem:
--------------------------
.titlebar {
background: #0759EB;
}

.titlebar:backdrop {
background: #8A0829;
color:white;
}

decoration {
border: 2px solid #0759EB;
background: #0759EB;
}
decoration:backdrop {
border: 2px solid #8A0829;
background: #8A0829;
}
--------------------------