.header {
    position: relative;
    height: 20vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
  background-image: url('/_img/grape.jpg');
    background-size: cover;
}

.header::before {
    content: "";
    position: absolute;
    top: 0px;
    right: 0px;
    bottom: 0px;
    left: 0px;
    background-color: rgba(0,0,0,0.1);
}