{{ cms_button('cta-hero') }}
cms_button will output:
{% if data.url %}
<a href="{{ data.url }}" rel="noopener" class="btn {{ data.theme }} {{ data.size }}" {% if data.opens_new_tab %}target="_blank"{% endif %}>
{{ data.text }}
</a>
{% else %}
<button class="btn {{ data.theme }} {{ data.size }}">
{{ data.text }}
</button>
{% endif %}