Ionic 2 card background image or color

I’m using the advanced-map example, i need to change the background of the card to an image with a pattern.

i tried doing background color and i can’t select it with css.
it does not apply background property.

what am i doing wrong

 .card-title {
position: absolute;
top: 36%;
font-size: 3.0em;
width: 100%;
font-weight: bold;
color: #fff;


ion-card {
position: relative;
text-align: center;
background-color: blue;

any tips are welcome thanks

I put in app.scss (or page.scss) after many tentative:

.card-background-page {
    background-color: #000;

I hope it’s useful.