stroke.svg

<svg width="100" height="64" fill="none" xmlns="http://www.w3.org/2000/svg">
<g clip-path="url(#a)">
<path d="M-17 30.5C-1 22 72-4 54 13 37.9 28.2-2.5 57.5 16 55.5s72-29 104-40" stroke="#850F78" stroke-width="10"/>
</g>
<defs>
<clipPath id="a">
<path fill="#fff" d="M0 0h100v64H0z"/>
</clipPath>
</defs>
</svg>