基于html5背景图片自适应代码

.jawbone-hero .jawbone-hero-image {
    position:absolute;
    background:transparent none no-repeat scroll 50% 0;
    background-size:cover;
    top:0;
    bottom:0;
    left:0;
    right:0;
    width:100%;
    margin:0 auto;
    z-index:-1
}
.jawbone-hero {
    height:100%;
    min-height:550px
}
.jawbone-hero .jawbone-hero-image {
    position:fixed
}
#h1.jawbone-takeover-minimulti .jawbone-hero-image {
    background-image:url(../images/hero-600.jpg)
}
@media (min-width: 600px) {
    #h1.jawbone-takeover-minimulti .jawbone-hero-image {
    background-image:url(../images/hero-1280.jpg)
}
}@media (min-width: 1016px) {
    #h1.jawbone-takeover-minimulti .jawbone-hero-image {
    background-image:url(../images/hero-2000.jpg)
}