Apply mobile scaling

script.js

@@ -210,7 +210,10 @@ toggleButtons
 
 const correctTouchOffset = (x, y) => {
 const canvasRect = canvas.getBoundingClientRect();
-return [x - canvasRect.left, y - canvasRect.top];
+return [
+  (x - canvasRect.left) * canvas.width / canvasRect.width,
+  (y - canvasRect.top) * canvas.width / canvasRect.width
+];
 }
 
 canvas.ontouchstart = event => {

style.css

@@ -32,4 +32,35 @@ body {
   border-radius: 10px;
   color: white;
   background-color: #222222;
+}
+
+@media screen and (max-width: 600px) {
+  body {
+    margin: 0;
+  }
+
+  #canvas {
+    border: solid black 2px;
+    border-radius: 10px;
+    background-color: wheat;
+    margin: 1em 0;
+    width: 80%;
+  }
+
+  #toggleButtons {
+    margin-bottom: 1em;
+  }
+
+  #toggleButtons * {
+    font-size: 1em;
+  }
+
+  #response {
+    font-size: 1em;
+    margin-bottom: 0.5em;
+  }
+
+  #clear{
+    font-size: 0.7em;
+  }
 }