diff --git a/www/common/onlyoffice/app-oo.less b/www/common/onlyoffice/app-oo.less
index 60510914d..c7bd64e01 100644
--- a/www/common/onlyoffice/app-oo.less
+++ b/www/common/onlyoffice/app-oo.less
@@ -44,6 +44,7 @@ body.cp-app-sheet, body.cp-app-oodoc, body.cp-app-ooslide {
         height: 100%;
         background-color: lightgrey;
         display: flex;
+        min-height: 0;
     }
     #cp-app-oo-editor {
         flex: 1;