boxicons/svg/regular/bx-message-alt-x.svg

<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24"><path d="M8.586 18 12 21.414 15.414 18H19c1.103 0 2-.897 2-2V4c0-1.103-.897-2-2-2H5c-1.103 0-2 .897-2 2v12c0 1.103.897 2 2 2h3.586zM5 4h14v12h-4.414L12 18.586 9.414 16H5V4z"/><path d="M9.707 13.707 12 11.414l2.293 2.293 1.414-1.414L13.414 10l2.293-2.293-1.414-1.414L12 8.586 9.707 6.293 8.293 7.707 10.586 10l-2.293 2.293z"/></svg>