div#cover-container {
    background-image: url("https://www.champlain.edu/Images/catalog/cco/cco-banner_2000-800_2.png");
    background-size: cover;
}
@media (min-width:1200px){

    div.d{
        width: 50%;
        position: relative;
        top: 30%;
        left: 25%;
        color: #FFFFFF;
    }

    div#cover-container {
        background-image: url("https://www.champlain.edu/Images/catalog/cco/cco-banner_2000-800_2.png");
        height: 700px;
    }

    div.d h1{
        font-size: 72px;
    }

    div.d h3 {
        color: white;
        font-size: 2rem;

    }
}

/* Small devices (tablets, 768px and up) */
@media (max-width: 768px) {

    div.d{
        width: 50%;
        position: relative;
        top: 30%;
        left: 25%;
        color: #FFFFFF;
        padding: 10px 0 10px 0;
    }

    div#cover-container {
        background-image: url("https://www.champlain.edu/Images/catalog/cco/cco-banner_2000-800_2.png");
    }

    div.d h1{
        font-size: 50px;
    }

    div.d h3 {
        color: white;
font-size: 32px;
    }

}