.btn--secondary
Submit button with outline and underline hover animation
<insert-markup>2.3.7.3-0</insert-markup>
Markup: templates/output/04-elements/forms/button/button-submit.html
<input class="btn [modifier class]" type="submit" title="This is a default title text" value="Button text"/>
Source:
assets/sass/04-elements/_elements.forms.scss, line 868