core/src/img/plus-white.svg
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M13 1C13 0.447715 12.5523 0 12 0C11.4477 0 11 0.447715 11 1V11L1 11C0.447716 11 0 11.4477 0 12C0 12.5523 0.447716 13 1 13L11 13V23C11 23.5523 11.4477 24 12 24C12.5523 24 13 23.5523 13 23V13L23 13C23.5523 13 24 12.5523 24 12C24 11.4477 23.5523 11 23 11L13 11V1Z" fill="white"/>
</svg>