Themes
From LimeSurvey Manual
LimeSurvey 3 introduces a complete new template engine system, based on Twig 1.29 and Bootstrap, and allowing template inheritance and template options.
Install Limesurvey 3.0+ to get access to the survey theme options feature. This option are not available in the older LimeSurvey versions!
The following section is still under construction. If you wish to get a short introduction on the new theme system from LimeSurvey 3.x, please continue reading the following wiki section. If you are still using LimeSurvey 2.x, please continue reading the following wiki section (we always recommend our users to upgrade their installations!).
Introduction
The theme options is available on LimeSurvey 3.x, and offers a set of various tools that allows the survey administrators to quickly and easily change the themes-related settings of their surveys.