html, body {
    height: 100%;    
}

body {
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}

footer {
    flex-shrink: 0;
}

header {
    background: no-repeat center center;
    background-size: cover;
    color: white;
}

.color-overlay {
    background-color: rgba(0,0,0,.4);
    min-height: 60vh;
}

.singleCol {
    max-width: 750px;
}

.collapse ul li a {
    color: white;
}

.collapse ul li a:hover {
    color: #898989;
}

.active {
    color: #33cc00 !important;
}

footer {
    background-color: #3a3a3a;
    color: white;
    font-size: small;
}

footer a {
    color: white;
}

footer a:hover {
    color: #898989;
}

@media (max-width: 767.98px) {
        
    .color-overlay {
        min-height: 30vh;
    }
}