diff --git a/web_src/css/markup/content.css b/web_src/css/markup/content.css
index 00283dd0a..b87383bca 100644
--- a/web_src/css/markup/content.css
+++ b/web_src/css/markup/content.css
@@ -540,6 +540,7 @@
 }
 
 .markup-block-error {
+  display: block !important; /* override fomantic .ui.form .error.message {display: none} */
   border: 1px solid var(--color-error-border) !important;
   margin-bottom: 0 !important;
   border-bottom-left-radius: 0 !important;