html {
    //background: url(../img/background-weddings.jpg) no-repeat center center fixed;
    //background-size: cover;
    //background-position-y: 100px;
}

.main-row {
    background: url(../img/background-weddings.jpg) no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}