Made by Rachel Winchester using the following material: Buttons block.
<!-- wp:buttons -->
<div class="wp-block-buttons"><!-- wp:button {"className":"is-style-fill"} -->
<div class="wp-block-button is-style-fill"><a class="wp-block-button__link">C’est ci n’est pas un bouton</a></div>
<!-- /wp:button --></div>
<!-- /wp:buttons -->