app/javascript/react/assets/icons/hamburger.svg
<svg width="24" height="18" viewBox="0 0 24 18" fill="none" xmlns="http://www.w3.org/2000/svg">
<rect width="24" height="2" fill="#3E4449"/>
<rect y="8" width="24" height="2" fill="#3E4449"/>
<rect y="16" width="24" height="2" fill="#3E4449"/>
</svg>