style.css

.button {
  -webkit-touch-callout:none;                /* prevent callout to copy image, etc when tap to hold */
  -webkit-text-size-adjust:none;             /* prevent webkit from resizing text to fit */
  -webkit-tap-highlight-color:rgba(0,0,0,0); /* prevent tap highlight color / shadow */
  -webkit-user-select:none;                  /* prevent copy paste, to allow, change 'none' to 'text' */
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none
}