body{
    margin:0;
    padding:0;
    font-size:13px;
    font-family:"Arial Black", Gadget, sans-serif;
    color:#FFFFFF;
    background-image: url('http://www.impotsuzannedelorme.com/images/cloud.jpg');
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
}

background-repeat:no-repeat;
background-size:auto;

background-size: contain;
background-position: center;
background-repeat: no-repeat;

img{ background: fixed; margin: 0px; }