One of Joomla's greatest strengths is all the great extensions that can be integrated to add functionality to your website. From the point of view of the designer, this has always been one of the biggest problems -- How to make all these different extensions look like they are on the same site. Joomla UI, with the included Bootstrap, is a way that Joomla 3.x fixes that. It is a stylesheet of UI -- the markup, the CSS, and the JavaScript behaviors, that extension & template developers can share. When templates and developers use the same UI, your site will look united. This presentation will be an introduction to Bootstrap and JUI, what it is, what it can do, and how it will affect templates in Joomla. This talk will continue in the session on LESS, the CSS pre-compiler, that is used with Bootstrap.