It does not find url image css, when I build android

Ionic Framework ionic-v3
1

Hello Everyone, my problem is that my ionic 2 project does not show background image declared in my css.

.scroll-content {
overflow-x: hidden;
overflow-y: hidden;
background: url("…/…/assets/images/FONDO1.png") no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
background-size: cover;
}

I tried removing “…/…/” and nothing.

Thank you.