* {
    font-family: sans-serif;
    font-size: 12pt;
}

html {
    line-height: 1.5;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.75rem;
}

h3 {
    font-size: 1.5rem;
}

body {
    background: lightgray;
    color: black;
}

header, footer {
    text-align: center;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

a {
    padding: 2px;
    color: darkblue;
    font-weight: bold;
}

a:visited {
    background: darkorchid;
}

#content {
    width: 768px;
}

@media only screen and (max-width: 768px) {
    #content {
	width: 100%;
    }
}

@media (prefers-color-scheme: dark) {
    body {
        background: darkslategray;
        color: linen;
    }

    a {
        color: cornflowerblue;
    }

    a:visited {
        color: orchid;
    }
}