Markup: templates/output/06-components/social-media-icons/twitter.html
<div class="c-socialmedia-icon"><svg viewBox="0 0 36 36">
<path class="shape" fill="none" d="M1 1h34v34H1z"/>
<path class="icon" fill="currentcolor" d="M26.965 12.742a7.5 7.5 0 0 1-2.119.581 3.718 3.718 0 0 0 1.622-2.042 7.622 7.622 0 0 1-2.345.888 3.689 3.689 0 0 0-6.383 2.519 3.776 3.776 0 0 0 .1.843 10.451 10.451 0 0 1-7.61-3.845 3.616 3.616 0 0 0-.5 1.856 3.69 3.69 0 0 0 1.641 3.072 3.678 3.678 0 0 1-1.671-.462v.046a3.692 3.692 0 0 0 2.959 3.62 3.724 3.724 0 0 1-1.659.064 3.7 3.7 0 0 0 3.453 2.563 7.4 7.4 0 0 1-4.576 1.578 7.832 7.832 0 0 1-.877-.05 10.5 10.5 0 0 0 5.668 1.658 10.423 10.423 0 0 0 10.498-10.49c0-.157 0-.315-.011-.472A7.452 7.452 0 0 0 27 12.757l-.035-.015z"/>
</svg>
</div>
Source:
assets/sass/06-components/_components.socialmedia-icons.scss, line 31