diff --git a/resources/js/chat-room/font-size.js b/resources/js/chat-room/font-size.js
index 52d10d4..f813b70 100644
--- a/resources/js/chat-room/font-size.js
+++ b/resources/js/chat-room/font-size.js
@@ -34,7 +34,8 @@ function applyInputToolbarFontSize(px) {
         return;
     }
 
-    const fontSize = `${px}px`;
+    const toolbarFontSize = Math.max(1, px - 1);
+    const fontSize = `${toolbarFontSize}px`;
     toolbarRow.style.fontSize = fontSize;
     toolbarRow.style.fontFamily = "inherit";
     toolbarRow.style.lineHeight = "1.2";