Markup: templates/output/06-components/social-media-icons/linkedin.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="M14.018 28.419h-2.99v-9.627h2.99zm-1.497-10.94a1.74 1.74 0 1 1 1.732-1.748 1.746 1.746 0 0 1-1.732 1.748zm12.685 10.94h-2.983v-4.686c0-1.117-.023-2.549-1.554-2.549-1.554 0-1.792 1.213-1.792 2.469v4.766H15.89v-9.627h2.868v1.313h.042a3.141 3.141 0 0 1 2.829-1.555c3.026 0 3.582 1.992 3.582 4.58v5.289z"/>
</svg>
</div>
Source:
assets/sass/06-components/_components.socialmedia-icons.scss, line 23