diff --git a/Chapter 13/matrix effect b/Chapter 13/matrix effect
index 786e146..8bc60ba 100644
--- a/Chapter 13/matrix effect	
+++ b/Chapter 13/matrix effect	
@@ -1,44 +1,39 @@
 <!doctype html>
 <html>
-
 <head>
     <title>Canvas HTML5</title>
-
 </head>
-
 <body>
-
-
     <div class="output"></div>
     <script>
-        const canvas = document.createElement('canvas');
-        const ctx = canvas.getContext('2d');
-        canvas.setAttribute('width', '600');
-        canvas.setAttribute('height', '400');
+        const canvas = document.createElement("canvas");
+        const ctx = canvas.getContext("2d");
+        canvas.setAttribute("width", "500");
+        canvas.setAttribute("height", "300");
         document.body.prepend(canvas);
-        const textPos = Array(60).join(0).split('');
-        console.log(textPos);
-
+        const colVal = [];
+        for(let x=0;x<50;x++){
+            colVal.push(0);
+        }
         function matrix() {
-            let output = '0';
-            ctx.fillStyle = 'rgba(0,0,0,.05)';
+            console.log(colVal);
+            let output = "0";
+            ctx.fillStyle = "rgba(0,0,0,.05)";
             ctx.fillRect(0, 0, canvas.width, canvas.height);
-            ctx.fillStyle = 'green';
-            textPos.map((posY, index) => {
-                output = String.fromCharCode(62 + Math.random() * 26);
-                console.log(output);
+            ctx.fillStyle = "green";
+            colVal.map((posY, index) => {
+                output = Math.random()<0.5?0:1;
                 let posX = (index * 10) + 10;
                 ctx.fillText(output, posX, posY);
-                if (posY > 100 + Math.random() * 1000) {
-                    textPos[index] = 0;
-                }
-                else {
-                    textPos[index] = posY + 10;
+                if (posY > 100 + Math.random() * 300) {
+                    colVal[index] = 0;
+
+                } else {
+                    colVal[index] = posY + 10;
                 }
             })
         }
         setInterval(matrix, 50);
     </script>
 </body>
-
 </html>
