diff --git a/public/css/Cis4/Cis.css b/public/css/Cis4/Cis.css
index ff1b181dd..2bb467048 100644
--- a/public/css/Cis4/Cis.css
+++ b/public/css/Cis4/Cis.css
@@ -407,6 +407,7 @@ html {
   background-color: var(--fhc-background);
   border-color: var(--fhc-border);
   padding: var(--fhc-cis-main-py) var(--fhc-cis-main-px);
+  min-width: 0; /* fix flex-grow with tabulator exceeding width */
 }
 
 #cis-main .fa-arrow-up-right-from-square {
@@ -854,4 +855,4 @@ html {
 #cis-main .modal-footer {
 	background-color: var(--fhc-secondary);
 	
-}
\ No newline at end of file
+}