Templating/Custom-CSS.md

@@ -22,7 +22,7 @@ div.slides {
 
 If you want to include a background image on **all** slides, e.g. the Uni Würzburg banner you can do this by adding the following code to the CSS file
 
-```
+```css
 body {
   background: url( "assets/title-banner-jmu.jpg" );
   background-size: contain;