.header-60th {
    background: url('https://www.grayson.edu/60-years/campus-1965.jpg');
    background-position:center;
    background-size:cover;
}
.header-60th img {
    background: rgba(255, 255, 255, .85);
    display:block;
    width: 20em;
    height: auto;
    margin: 3em auto 3em auto;
}
@media (min-width: 768px) {
    .header-60th img {
        margin: 5em 0 3em 0;
    }
}