var COACHBOX = document.querySelectorAll (".enlarge");
var BUTTON = document.querySelectorAll (".coach-button");

var OVERLAY = document.querySelector (".coach-container");
var LIGHTWINDOW = document.querySelector (".lightwindow");
var BOX = document.querySelector (".coach-box")

function coachBubble () {
  OVERLAY.classList.toggle ("-enable");
  LIGHTWINDOW.classList.toggle ("-enable");
  BOX.classList.toggle ("-enable");
}

for (var i=0; i<BUTTON.length; i++) {
  BUTTON[i].addEventListener('click',coachBubble,false);
}
for (var i=0; i<COACHBOX.length; i++) {
  COACHBOX[i].addEventListener('click',coachBubble,false);
}