Bootstrap Navbar Background-Image

I have tried everything here in the code and there is no way, I can not get the bootstrap navbar to have the image. The most bizarre is that in Safari it appears, in Chrome not.

Follow the code:

.navbar {
        background: url("bootstrap/images/nav-bar.png") repeat-x !important;
        background-size: cover;
    }

I've tried it some other way, like this:

.admin-bar .navbar-fixed-top {
        background: url("bootstrap/images/nav-bar.png") repeat-x;
        background-size: cover;
        border-style: none;
        margin-top: 30px;
    }

No way. If it is possible for someone to help, it's too complicated to find out. As I said, the strange thing is that in Safari it appears, in Chrome it gets nothing, just the links as if it had nothing behind, transparent.