<div class="column-1">
<div class="block-1"></div>
<div class="block-6"></div>
</div>
<div class="column-2">
<div class="block-2"></div>
</div>
<div class="column-3">
<div class="block-3"></div>
<div class="block-4"></div>
<div class="block-5"></div>
</div>