:root {
    font-family: 'Arial', sans-serif;
    box-sizing: border-box;
}

body {
    margin: 3em 0 0 0;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 3em;
    border-bottom: 1px solid #C0C0C0;
    background-color: #FFFFFF;
}

header img {
    height: 2.5em;
    margin: 0.25em;
}

nav {
    height: 100%;
}

nav ul {
    display: flex;
    list-style-type: none;
    margin: 0;
    padding: 0;
    justify-content: center;
    align-items: center;
    height: 100%;
}

nav li {

}

nav li a {
    text-decoration: none;
    padding: 1em;
}

table td {
    padding: 0.125em 0.5em;
}