We sometimes need to create our own themes instead of using the predefined ones. Web applications should often feature a company-specific look and feel, which is constant and preset by company-wide style guides. Creating new themes is easy with PrimeNG, because it is powered by the ThemeRoller CSS Framework (http://jqueryui.com/themeroller). ThemeRoller provides a powerful and easy-to-use online visual tool. In this section, we will systematically show all the required steps to create a new theme. There are two ways how to create a new theme, either by ThemeRoller or from scratch with Sass.