html {
    color-scheme: light dark;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}

h1 {
    border-bottom: 1px solid;
}
h2 {
    margin-top: 2em;
}

h4 {
    margin: 0;
}

section {
    display: flex;
    flex-wrap: wrap;
    gap: 2em;
    align-items: flex-start;
}
section > * {
    flex: 1 0 10em;
    text-align: center;
}

main {
    max-width: 40em;
    margin: 0 auto;
    padding: 1em;
}
main > * + * {
    margin-top: 2em;
}

svg {
    width: 100%;
    height: auto;
    max-width: 20em;
}

output {
    font-weight: bold;
}