a {
    color: black;
}

h1,h2,h3,h4 {
    margin-bottom: 0.5em;
    margin-top: 0.5em;
}

main {
    font-family: -apple-system, 
                BlinkMacSystemFont, 
                "Segoe UI", 
                Roboto, 
                "Noto Sans",
                Oxygen-Sans, 
                Cantarell, 
                "Helvetica Neue", 
                Ubuntu, 
                sans-serif;
    font-size: 1.2rem;
    margin: 0 auto;
    padding: 2ch;
    max-width: 60ch;
    overflow: hidden;
    color: black;
    background-color: rgba(255, 255, 255, 0.9);
    line-height: 1.7em;
    min-height: 100vh;
}