diff --git a/site/layouts/partials/about.html b/site/layouts/partials/about.html
index aec0e16..6648be8 100644
--- a/site/layouts/partials/about.html
+++ b/site/layouts/partials/about.html
@@ -14,7 +14,9 @@
                 <center>
                   <video controls="controls" poster="/img/poster.jpg" crossorigin="crossorigin" width="100%">
                     <source src="https://download.fsfe.org/videos/pmpc/pmpc_desktop.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"' media="screen and (min-device-width:1000px)" />
+                    <source src="https://download.fsfe.org/videos/pmpc/pmpc_desktop.webm" type='video/webm; codecs="vp9, opus"' media="screen and (min-device-width:1000px)" />
                     <source src="https://download.fsfe.org/videos/pmpc/pmpc_mobile.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"' media="screen and (max-device-width:999px)" />
+                    <source src="https://download.fsfe.org/videos/pmpc/pmpc_mobile.webm" type='video/webm; codecs="vp9, opus"' media="screen and (max-device-width:999px)" />
                     
                     <!--
                     <track src="https://download.fsfe.org/videos/15years/vtt/15years-FSFE.en.vtt" kind="subtitle" srclang="en" label="English" default="default">