diff --git a/public/index.html b/public/index.html
index 2c57fd0..91b28b8 100644
--- a/public/index.html
+++ b/public/index.html
@@ -149,8 +149,9 @@
             const leds = document.querySelectorAll('.led')
             for (let y = 0; y < 8; y++) {
                 for (let x = 0; x < 8; x++) {
-                    if (array[y][x] == 1) leds[i].classList.add('on')
-                    else leds[i].classList.remove('on')
+                    const n = y * 8 + x
+                    if (array[y][x] == 1) leds[n].classList.add('on')
+                    else leds[n].classList.remove('on')
                 }
             }
         })