diff --git a/index.js b/index.js
index 997b8d3..3433889 100644
--- a/index.js
+++ b/index.js
@@ -7,6 +7,9 @@ for(let y = 0; y < HEIGHT; y++) {
     for(let x = 0; x < WIDTH; x++) {
         const pixel = document.createElement('div');
         pixel.className = 'pixel';
+        pixel.addEventListener('click', () => {
+            pixel.style.backgroundColor = 'red';
+        });
         row.appendChild(pixel);
     }
     document.body.appendChild(row);