var $board = $('.board')

$.fn.board = function () {
var $board = $(this)
var width = $board.width()
var height = $board.height()
$board.on('mousemove', function (e) {
  $board.css({
    transform: `rotateX(${-(e.originalEvent.layerY - height / 2) / height * 10}deg) rotateY(${(e.originalEvent.layerX - width / 2 ) / width * 10}deg)`
  })
})

$board.on('mouseleave', function () {
  $board.css({
    transform: ''
  })
})
}

$board.board()