html {
    height: 100%;
    background-image: url('../images/IN_COSTR-01.png');
    background-size: auto 100%;
    background-repeat: no-repeat;
    background-position: center top;
}
@media screen and (max-device-width: 640px) {
    html {
        background: url('../images/IN_COSTR_mobile-01.png') no-repeat center center fixed;
        -webkit-background-size: cover;
        -moz-background-size: cover;
        -o-background-size: cover;
        background-size: cover;
    }
}

#icons{
    text-align:center;
    width:100%;
    position:absolute;
    bottom: 40px;
    left: 0px;
}
#icons img{
    width: 50px;
}