body {
    height: 125vh;
    margin-top: 0px;
    padding: 30px;
    background-size: cover;
    font-family: sans-serif;
}
header {
    background-color: darkred;
    position: fixed;
    left: 0;
    right: 0;
    top: 0px;
    height: 30px;
    display: flex;
    align-items: center;
    box-shadow: 0 0 25px 0 black;
}
header * {
    display: inline;
}
header li {
    margin: 90px;
}
header li a {
    color: black;
    text-decoration: none;
}