A theme controls the visual appearance of Metrici and the behaviour of browser-based components.
You can select one the buiilt-in themes for yourself from the settings page. If you are authorised, you can also set the theme for everyone in your account. This is great if you want to try a different look and feel.
As well as using the built-in themes, you can modify existing themes and create new themes from scratch.
The easiest way to do this is by using the Theme builder. For more specialised uses, you may need to setup a theme manually. The parts of this section after theme builder covers how to do this.