Here's a neat solution. (Honestly I surprised myself with this.) CSS has something called counters, where you can set, for example, automatic chapter numbers on each heading. A bit of modification gives you the below; You'll need to sort out padding etc yourself.
ol {
counter-reset: list;
}
ol > li {
list-style: none;
}
ol > li:before {
content: counter(list, lower-alpha) ") ";
counter-increment: list;
}
<span>custom list style type (v1):</span>
<ol>
<li>Number 1</li>
<li>Number 2</li>
<li>Number 3</li>
<li>Number 4</li>
<li>Number 5</li>
<li>Number 6</li>
</ol>
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