HTML:
#backgroundproduct {
position: fixed;
top: 5%;
left: 5%;
width: 90%;
height: 90%;
z-index: 12;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
background-position: top;
}
<div id="backgroundproduct" style="background-image: url(http://example.com/example.jpg)">
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