body {
    background: #eee;
}
#header {
    background-image: url('../img/background.jpg');
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.subheader {
    background: linear-gradient( rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.2) );
    color: #fff;
    margin: 0;
    padding: 1%;
}
#prefooter {
    background: #222;
    color: #fff;
    padding: 3%;
}   

@media ( min-width: 1200px ) {
    #header {
        height: 40vh;
    }
    .subheader {
        height: 40vh;
        .contenido { 
            width: 50%;
        }
    }
}
@media ( max-width: 768px ) {
    #header {
        height: 40vh;
    }
    .subheader {
        height: 40vh;
        .contenido { 
            width: 90%;
        }
    }
}

.row {
    --bs-gutter-x: 0;
    --bs-gutter-y: 0;
}
.scol {
    padding-left: 15px;
    padding-right: 15px;
}