diff --git a/index.html b/index.html
index 6170219..60eb604 100644
--- a/index.html
+++ b/index.html
@@ -116,6 +116,7 @@
             white-space: pre-wrap;
             color: var(--text-color);
             overflow-y: auto;
+            max-height: 400px; /* Set a maximum height for the output box */
             box-sizing: border-box;
         }