How to set a background image to a panel?

[Limey]

I have tried everything i can think of ... this should work but i get nothing... any help would be greatly appreciated...

Here is my CSS

.dashboard-row .dashboard-panel div[id^="#panel1"] {
background-image: url("/static/app/xxx/blue-background.png") !important;
background-repeat: no-repeat !important;
background-size: cover !important;
}