svg/control_border_top.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
    <defs>
        <linearGradient id="gradient" x2="0%" y2="100%">
            <stop offset="0%" stop-color="white" stop-opacity="1"/>
            <stop offset="15%" stop-color="white" stop-opacity="0"/>
            <stop offset="100%" stop-color="white" stop-opacity="0"/>
        </linearGradient>
    </defs>
    <rect stroke="url(#gradient)" fill="none" x="0.5" y="0.5" width="15" height="15" rx="3.5"/>
</svg>