diff --git a/assets/index.html b/assets/index.html
index 167276d..fccabb5 100644
--- a/assets/index.html
+++ b/assets/index.html
@@ -3,6 +3,18 @@
 <head>
     <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
 </head>
+<style>
+    body {
+        margin: 0;
+        padding: 0;
+        background: #000;
+    }
+    canvas {
+        display: block;
+        margin: 0 auto;
+        background: #000;
+    }
+</style>
 <body>
     <canvas id="canvas"></canvas>
     <script>
