diff --git a/web_responsive/static/src/components/attachment_viewer/attachment_viewer.scss b/web_responsive/static/src/components/attachment_viewer/attachment_viewer.scss
index 454fd9573..57f537454 100644
--- a/web_responsive/static/src/components/attachment_viewer/attachment_viewer.scss
+++ b/web_responsive/static/src/components/attachment_viewer/attachment_viewer.scss
@@ -37,7 +37,7 @@
                 display: none;
             }
             .o_AttachmentViewer_viewIframe {
-                width: 95%;
+                width: 100% !important;
             }
         }
     }