Set same CSS property to public app-content.

Signed-off-by: Ivan Sein <ivan@nextcloud.com>

css/style.css

@@ -2,7 +2,8 @@
 	height: 100%;
 }
 
-.app-spreed #app-content {
+.app-spreed #app-content,
+#body-public #app-content {
     overflow: hidden;
 }