@media screen and (min-width: 768px) {
        div {
            margin-top:100px;
        }
    }

    }
    @media screen and (min-width: 992px) {
        div {
            margin-top:200px;
        }
    }


    @media screen and (min-width: 1200px) {
        div {
            margin-top:300px;
        }

    }