adding top margin

<div>
    (empty)
</div>
<div>
    No margin-top class
</div>
<div class="margin-top-1">
    .margin-top-1
</div>
<div class="margin-top-2">
    .margin-top-2
</div>
<div class="margin-top-3">
    .margin-top-3
</div>
<div class="margin-top-4">
    .margin-top-4
</div>
        

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