diff --git a/kolibri2zim/templates/assets/epub_embed.css b/kolibri2zim/templates/assets/epub_embed.css
index 9e61ec6..25aed6d 100644
--- a/kolibri2zim/templates/assets/epub_embed.css
+++ b/kolibri2zim/templates/assets/epub_embed.css
@@ -33,7 +33,6 @@ body {
     position: relative;
     margin: 10px auto;
     background: white url('ajax-loader.gif') center center no-repeat;
-    top: calc(50vh - 400px);
 }
 
 #viewer.spreads .epub-view>iframe {