:root {
    --inset: 1rem;
}

html {
    margin: var(--inset);
}

body {
    margin: auto;
    max-width: 640px;
    color: #111;

    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: calc(100vh - 2 * var(--inset));
}

header {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    column-gap: 1rem;
}

header img {
    min-width: 350px;
    flex: auto;
}

header nav {
    flex: auto;
}

header nav ul {
    display: flex;
    column-gap: 1rem;
    justify-content: center;

    list-style: none;
    margin: 0;
    padding: 0;
}