tachyons is nice for simple css-only stuff, but let's use "Semantic UI" because
it has a bunch of javascript form stuff.

    <link rel="stylesheet" href="https://cdn.jsdelivr.net/semantic-ui/2.2.13/semantic.min.css">
    <script src="https://cdn.jsdelivr.net/semantic-ui/2.2.13/semantic.min.js"></script>