diff --git a/gulpfile.esm.js/plugins/pandoc.js b/gulpfile.esm.js/plugins/pandoc.js
index 70f4fa5c53251b58690ffc3e7c0352a0899d856c..ae5e66a36ffbba828963017450e7503840760fd3 100644
--- a/gulpfile.esm.js/plugins/pandoc.js
+++ b/gulpfile.esm.js/plugins/pandoc.js
@@ -18,8 +18,8 @@ const DEFAULTS = {
   revealJSURL: "reveal.js",
   template: path.normalize(__dirname + "/../../templates/revealjs.html"),
   variables: {
-    width: 1024,
-    height: 768,
+    width: 960,
+    height: 700,
     navigationMode: "linear",
     theme: "inrae",
     slideNumber: true,