overlap when use multi-width & multi-height photo

[alirezahatami]

i have multi-width and multi-height photo. i used "Nested" instead of "packery".
Now in default demo, i only change the default html values in "index.html" and not changed anything more. but overlapping, How to stop photos from overlapping?

<div id="container">
  <div class="box">image tag 1</div>
  <div class="box">image tag 2</div>
  <div class="box">image tag 3</div>
</div>