Add a demo a slide backgrounds
diff --git a/inst/rmarkdown/templates/revealjs_presentation/skeleton/skeleton.Rmd b/inst/rmarkdown/templates/revealjs_presentation/skeleton/skeleton.Rmd
index 006c7e2..570db11 100644
--- a/inst/rmarkdown/templates/revealjs_presentation/skeleton/skeleton.Rmd
+++ b/inst/rmarkdown/templates/revealjs_presentation/skeleton/skeleton.Rmd
@@ -100,4 +100,23 @@
output:
revealjs::revealjs_presentation:
transition: zoom
-```
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+```
+# Slide background {data-background-color="#33ffd8"}
+
+This slide has another background changed using `data-background-color`.
+
+Next vertical slides show variants
+
+## Using an image 1 {data-background-image="https://cran.r-project.org/Rlogo.svg"}
+
+Which will be used in whole background
+
+## Using an image 2 {data-background-image="https://cran.r-project.org/Rlogo.svg" data-background-repeat="repeat" data-background-size="100px"}
+
+## Using a gif {data-background-image="https://media4.giphy.com/media/vKHKDIdvxvN7vTAEOM/giphy.gif" data-background-size="contain" data-background-repeat="no-repeat"}
+
+## What to customize
+
+Most of configuration there should work
+
+https://revealjs.com/backgrounds/
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