body {
    font-family: "Open sans", Helvetica, Arial, sans-serif;
}
.masthead {
    background-size: cover;
    min-height: 60vh;
    position:relative;
    color: white;
    text-shadow: 2px 2px 2px rgba(0,0,0,.2);
}
h1{
    font-size:4rem;
}
.color-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,.2);
}
@media (max-width: 768px){
    .masthead{
        min-height: 30vh;
    }
    h1 {
        font-size: calc(1.525rem + 3.3vw);
    }
}
h1.display-4 {
    color:white;
}