Responsive background CSS position

Problem

I have a problem with my background on mobile phones.

I use media query and I can't make position of that background image.

Here you can see a background image.

This is my media query code:

@media only screen (max-device-width : 360px) {

    .sidebar {
        display: none;
    }

    li#menu-item-631 a {
        width: 100px;
    }

    #navmenu {
        margin-top: 20px;
        margin-left: 0;
        margin-right: 0;
    }

    .content {
        width: auto;
        height: auto;
        margin-left: 0;
        margin-top: -130px;
    }

    .contentsing {
        width: 500px;
        height: auto;
        margin-left: 20%;
        margin-right: 5%;
        margin-top: -150px;
    }
}

And this is my background code

body {
    background: url() no-repeat top center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    font-family: AntonioLight;
    font-size: 1em;
    padding: 0;
    margin: 0;
}
Problem courtesy of: Zzuum

Solution

If you want your background image to adapt to different screen sizes (priorizing the center of the image, for example), you might be looking for something like this: http://johnpatrickgiven.com/jquery/background-resize/

Solution courtesy of: Filly

Discussion

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