* {
    box-sizing: border-box;
    margin: 0;
}
body {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: 'Courier New', Courier, monospace;
    background: beige;
}
header {
    width: 100%;
}
header nav ul {
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: space-evenly;
    flex-direction: row;
}

header nav ul li {
    padding: 5px;
    list-style: none;
}