.our_philosophy{
    background: url(../img/pictures/osmo-phil.jpg) no-repeat center center fixed;
}

.cover{
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;"
}

.home{
    background: url(../img/pictures/osmo-phil.jpg) no-repeat center center fixed;
}

.our_approach{
    background: url('../img/pictures/engagement.jpg') no-repeat center center fixed;
}