.unselectable {
  -webkit-touch-callout: none ;
  -webkit-user-select: none ;
  -khtml-user-select: none ;
  -moz-user-select: none ;
  -ms-user-select: none ;
  user-select: none ;
}
.selectable {
  -webkit-touch-callout: "" ;
  -webkit-user-select: "" ;
  -khtml-user-select: "" ;
  -moz-user-select: "" ;
  -ms-user-select: "" ;
  user-select: "" ;
}