<p>Default uses the AOS library: <a href="https://michalsnik.github.io/aos" target="_blank">https://michalsnik.github.io/aos</a><br/> You can override the animation library in your theme by using <br /><code>libraries-override:<br />&nbsp;&nbsp;bootstrap_styles/plugin.scroll_effects.build: your_theme/your_new_library_definition</code><br /><small>For more information, please check: <a href="https://www.drupal.org/node/2497313" target="_blank">https://www.drupal.org/node/2497313</a></small></p>