Documentation doesn't mention how modals are linked.

[lewisgoddard]

<button class="js-leanmodal-button" data-modal-id="js-leanmodal-modal">Click me</button>

<div id="js-leanmodal-modal" class="leanmodal">
    I get loaded
    <button class=".js-leanmodal-close">close me</button>
</div>

<script>
    $('.leanmodal').leanModal();
</script>