* {
    margin: 0;
}

html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    text-align: center;
    background-color: whitesmoke;
    font-family: sans-serif;
    color: hsl(214, 5%, 15%);
}

header {
    background-color: lightgray;
    height: 100px;
    line-height: 100px;
}

main {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
}

a {
    color: hsl(214, 5%, 15%);
    text-decoration: none;
    padding: 5px;
    margin: 5px;
    font-size: 1.5rem;
}