CSS: Multi-class Attributes
HTML attributes tend to just have a single class assigned, but this doesn’t mean that that’s all you’re allowed. You can combine as many classes as you wish, meaning a CSS palette containing just a few basic ingredients can leand to a much wider range of styles if combined intelligently.
Classes should be separated with a space, not a comma. If any style rules overlap between the classes, a class further down the CSS document will always override those above.
<h6 class="boxout highlighted">...</h6>
