disable right click draw

www/draw.html

@@ -114,7 +114,7 @@
 		.toolbox {
 			position: absolute;
 			left: 0;
-			top: 50px;
+			top: 40%;
 			z-index: 100;
 			background-color: white;
 			padding: 5px;

www/draw.js

@@ -88,7 +88,7 @@ class Canvas {
             if (ev.pointerType == "touch" || ev.buttons & 4) { // 4: middle mouse button
                 this.isMoving = true;
                 this.startMoveCanvas(ev);
-            } else { // pointerType == pen or mouse
+            } else if(ev.buttons & 1) { // pointerType == pen or mouse
                 this.startStroke(ev);
             }
         });