Update toolbar-button.css

assets/icons/announcement.svg

+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" width="20" height="20" transform="scale(-1, 1) translate(0, 0)">
+  <rect width="256" height="256" fill="none"/>
+  <path d="M160,80V200.67a8,8,0,0,0,3.56,6.65l11,7.33a8,8,0,0,0,12.2-4.72L200,160" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="16"/>
+  <path d="M40,200a8,8,0,0,0,13.15,6.12C105.55,162.16,160,160,160,160h40a40,40,0,0,0,0-80H160S105.55,77.84,53.15,33.89A8,8,0,0,0,40,40Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="16"/>
+</svg>