Edit in JSFiddle

<ul class="ul-main">
	<li class="li-main">block 1</li>
	<li class="li-main">block 1</li>
	<li class="li-main">block 1</li>
	<li class="li-main">block 1</li>
	<li class="li-main">block 1</li>
	<li class="li-main">block 1</li>
	<li class="li-main">block 1</li>
	<li class="li-main">block 1</li>
</ul>