The "new" datatracker uses Twitter Bootstrap for the UI.

Get familiar with http://getbootstrap.com/getting-started/ and use those
UI elements instead of cooking up your own.

We have some site-wide customization applied to the bootstrap version we keep
in bootstrap/ (from which the minified dist version is built); it modifies
some stuff under less/

We also apply some additional customizations in static/css/ietf.css; we
should eventually move that under bootstrap/less/ if possible. (ietf.css was
what Lars used initially for customization with an unmodified bootstrap.)

Some ground rules:

* Think hard before tweaking the bootstrap CSS, it will make it harder to
  upgrade to future releases.

* No <style> tags in the HTML! Put CSS into the "morecss" block of a
  template instead.

* CSS that is used by multiple templates goes into static/css/ietf.css.

* Javascript that is only used on one template goes into the "js" block of
  that template.

* Javascript that is used by multiple templates goes into static/js/ietf.js.

* Every template includes jquery, so write jquery code and not plain Javascript.
  It's shorter and often faster.

* No CSS, HTML styling or Javascript in the python code!

* Templates that use jquery or bootstrap plugins include the css file in the
  "pagehead" block, and the Javascript in the "js" block.