Primer

HTML

<a href="#" class="button button--green">Link as a button</a>
<button class="button button--green" type="input">Button as a button</button>

Twig

<a href="#" class="button button--green">{{ button_one }}</a>
<button class="button button--green" type="input">{{ button_two }}</button>

{
    "button_one": "Link as a button",
    "button_two": "Button as a button"
}