<div class="parent">
  <input type="checkbox" id="clickMe">
  </input>
  <label for="clickMe">
  </label>
  <div class="treeWrapper">
    <div class="wood">
    </div>
    <div class="tree tri_1">
    </div>
    <div class="tree tri_2">
    </div>
    <div class="tree tri_3">
    </div>
    <div class="redball rb_1">
    </div>
    <div class="redball rb_2">
    </div>
    <div class="redball rb_3">
    </div>
    <div class="yellowball yb_1">
    </div>
    <div class="yellowball yb_2">
    </div>
    <div class="yellowball yb_3">
    </div>
  </div>
  <div class="message">
    <span>
      Merry Christmas
    </span>
  </div>
</div>