add some reposity

style/sample.css

@@ -4,4 +4,10 @@ h1 {
     display: inline-block;
     position:sticky;
     top: 0;
-  }
+  }
+canvas{
+  width:50%;
+  height:50%;
+  align-items: center;
+  border: 1px solid black;
+}