.banner{
height: 700px;
background: url("https://www.gonhermusiccenter.com/wp-content/uploads/2020/10/fondo-boletin-scaled.jpg") fixed center/cover;
display: flex;
align-items: center;
justify-content: center;
} .banner::before{
content: "";
height: 100%;
width: 100%;
background:#11D99B;
opacity: 0.8;
}
