diff --git a/web/src/components/structured/structured.css b/web/src/components/structured/structured.css
index dfe34f1..46eed88 100644
--- a/web/src/components/structured/structured.css
+++ b/web/src/components/structured/structured.css
@@ -481,6 +481,7 @@
 }
 
 .st-tool-arg {
+  flex: 1 1 0;
   color: var(--muted);
   overflow: hidden;
   text-overflow: ellipsis;