diff --git a/stylesheets/components/Lightbox.scss b/stylesheets/components/Lightbox.scss
index e0b9dd055f..fa5d547c00 100644
--- a/stylesheets/components/Lightbox.scss
+++ b/stylesheets/components/Lightbox.scss
@@ -98,6 +98,11 @@
     width: auto;
   }
 
+  &__object--container--zoomed &__object {
+    width: 100%;
+    height: 100%;
+  }
+
   &__unsupported {
     @include button-reset;
     flex-grow: 1;