More accessible, inclusive styling.

[NickColley]

I was wondering if we could update the site styling so it's more inclusive? I find the text really hard to read at the moment since it's so small.

html, body {
    font-size: 20px;
    font-family:
      -apple-system,
      BlinkMacSystemFont,
      "Segoe UI",
      "Roboto",
      "Oxygen",
      "Ubuntu",
      "Cantarell",
      "Fira Sans",
      "Droid Sans",
      "Helvetica Neue",
      sans-serif;
    line-height: normal;
    margin: 1rem;
}

h3 {
    margin-top: 2rem;
}

h2 {
    margin-top: 2rem;
    margin-bottom: 2rem;
}

p, ul {
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

ul {
    padding-left: 0;
}
li {
    margin-bottom: .5rem;
}

pre {
    overflow-y: auto;
}

.shell {
    margin: auto;
    max-width: 35em;
}

[shanselman]

Thanks! Checked in