In order to use a number input just use an input type="number" with the class a-input, add
two buttons next to it and wrap all items inside a div with the class a-inputWrapper.
Input numbers also needs a modifier, -compact.
<div class="a-inputWrapper -compact">
<input type="number" class="a-input" value="0">
<button></button>
<button></button>
</div>
We have two modifiers in relation to the size of the component.
-small-largeExample
<div class="a-inputWrapper -compact">
<input type="number" class="a-input -small" value="0">
<button></button>
<button></button>
</div>