diff --git a/inventory/templates/coffee.html b/inventory/templates/coffee.html
index 62ee55e..f3b5ab2 100644
--- a/inventory/templates/coffee.html
+++ b/inventory/templates/coffee.html
@@ -1,5 +1,11 @@
 {% extends 'layout.html' %}
 
+{% block style %}
+.clicked {
+    outline: 2px solid red;
+}
+{% endblock %}
+
 {% block content %}
     <div class="container">
         {% for x in range(level + 3) %}
@@ -21,6 +27,7 @@
 
     document.querySelectorAll('.form-check-input').forEach(checkbox => {
         checkbox.addEventListener('change', function() {
+            checkbox.classList.toggle('clicked');
             const [x, y] = this.id.split('-').slice(1).map(Number);
             const neighbors = [
                 [x - 1, y],