message: Use "pointer" custor for cancel button
diff: @@ -117,6 +117,7 @@ function loadHint (hint: ChallengeHint): HTMLElement {
  cancelButton.style.position = 'relative'
  cancelButton.style.zIndex = '20001'
  cancelButton.style.bottom = '-22px'
  + cancelButton.style.cursor = 'pointer'
  elem.appendChild(picture)
  elem.appendChild(textBox)
  