app/assets/svgs/heroicons/solid/plus.svg
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true" data-slot="icon">
<path fill-rule="evenodd" d="M12 3.75a.75.75 0 0 1 .75.75v6.75h6.75a.75.75 0 0 1 0 1.5h-6.75v6.75a.75.75 0 0 1-1.5 0v-6.75H4.5a.75.75 0 0 1 0-1.5h6.75V4.5a.75.75 0 0 1 .75-.75Z" clip-rule="evenodd"/>
</svg>