header {
    background-image: linear-gradient( rgb(82, 110, 141), rgb(72, 78, 84));
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    /* background-attachment: fixed; */
    width: 100%;
    height: 100vh;
    color: rgb(220,220,220);
    font-weight: bold;
    display: flex;
    align-items: center;
    flex-direction: column;
    position: relative;
}