diff --git a/README.md b/README.md
index 2280b33c..290e3770 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
-
+
reveal.js is an open source HTML presentation framework. It enables anyone with a web browser to create beautiful presentations for free. Check out the live demo at [revealjs.com](https://revealjs.com/).
diff --git a/demo.html b/demo.html
index 36d83028..ab654977 100644
--- a/demo.html
+++ b/demo.html
@@ -197,6 +197,25 @@
+
+ Lightbox
+ Turn any element into a lightbox using data‑preview‑image & data‑preview‑video.
+
+
+
+ <img src="image.png" data-preview-image="image.png">
+
+

+
+
+
+ <img src="video.png" data-preview-video="video.mp4">
+
+

+
+
+
+
Add the r-fit-text class to auto-size text
FIT TEXT
diff --git a/examples/backgrounds.html b/examples/backgrounds.html
index 19d40c34..febb6bf3 100644
--- a/examples/backgrounds.html
+++ b/examples/backgrounds.html
@@ -89,7 +89,7 @@
Same background twice (2/2)
-
+
diff --git a/examples/preview-overlays.html b/examples/lightbox.html
similarity index 100%
rename from examples/preview-overlays.html
rename to examples/lightbox.html
diff --git a/examples/markdown.html b/examples/markdown.html
index 4d69f052..885ffe83 100644
--- a/examples/markdown.html
+++ b/examples/markdown.html
@@ -121,7 +121,7 @@
diff --git a/examples/markdown.md b/examples/markdown.md
index 1315172c..279c58a2 100644
--- a/examples/markdown.md
+++ b/examples/markdown.md
@@ -33,7 +33,7 @@ Content 3.2
## External 3.3 (Image)
-
+
## External 3.4 (Math)
diff --git a/examples/scroll.html b/examples/scroll.html
index afe7d5a0..cea39945 100644
--- a/examples/scroll.html
+++ b/examples/scroll.html
@@ -91,7 +91,7 @@
-