header{
    background:
            linear-gradient(
                    rgba(0, 0, 0, 0.5),
                    rgba(0, 0, 0, 0.5)
            ),
            url('../img/6.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    height: 43vh;
    position:relative;
    text-align: center;
}
header h1{
    position: absolute;
    top: 40%;
    left: 0;
    right: 0;
    color: #ddd;
}
footer{

}