Developing themes for QTI content
Summar.io provides the possibility to add a theme per learning unit which allows all QTI content within that and underlying learning units to have a unique look and feel.
Structure of themes
A theme consists of a CSS file named QTIplayer.css, and if applicable images
which are being referred to within the CSS. These files compressed into a Zip
file form a theme that can be imported in the catalog. 
The CSS can be created by reverse engineering the HTML attributes within the
QTI environment, and styling them as desired. This makes it important to have
an understanding of CSS to be able to set up a solid theme.
Adding themes
Adding a theme is done by clicking the small palette icon within the learning unit to which the theme should be applied. A small dialog containing an 'Add theme' button will be shown, clicking this button will allow a theme Zip file to be uploaded.
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