boxicons/static/img/svg/duplicate.svg

<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M11 10L9 10 9 13 6 13 6 15 9 15 9 18 11 18 11 15 14 15 14 13 11 13z"/><path d="M3,22h14c0.553,0,1-0.447,1-1V7c0-0.552-0.447-1-1-1H3C2.447,6,2,6.448,2,7v14C2,21.553,2.447,22,3,22z M4,8h12v12H4V8z"/><path d="M21,2H8v2h12v12h2V3C22,2.448,21.553,2,21,2z"/></svg>