changing size to be relative to viewport

public/index.html

@@ -36,8 +36,8 @@
 
     <style>
         canvas {
-            width: 100%;
-            height: 100%;
+            width: 100vw;
+            height: 90vh;
             padding-left: 0;
             padding-right: 0;
             margin-top: 20px;