Problems on Windows Phones

[NokFrt]

My game runs very well on WP, but I have two problems:

 

1. when I tap the screen, I can see a small gray circle on a place where I tapped.

2. when I slide down or up, the whole canvas is move up or down.

 

Does anybody know how to disable the gray circle and how to fix the browser's viewport?

 

I use the following CSS in my index.html

* {user-select: none;-webkit-tap-highlight-color: rgba(0, 0, 0, 0);-webkit-touch-callout: none;-webkit-user-select: none;-moz-user-select: none;-ms-user-select: none;}

and my canvas is:

<canvas id="canvas" width="540" height="540" style="position: absolute;"></canvas>

[enpu]

Try this:

html {    -ms-touch-action: none; /* Direct all pointer events to JavaScript code. */}