<div class="rel" id="example5reference1">
    <p class="bold">Pop</p>
    <p class="thin">on the bottom</p>
</div>

<div class="popper" id="example5popper1">
    <p class="bold">Popper on bottom</p>
    <p class="thin">Flips when hits viewport</p>
    <div class="popper__arrow" x-arrow></div>
</div>

<script>
    document.addEventListener('DOMContentLoaded', function(){
        var pop1 = new Popper(example5reference1, example5popper1, {
            placement: 'bottom'
        });
    }, false);
</script>