flutter_svg/example/assets/simple/width_height_viewbox.svg

<svg width="18px" height="18px" viewBox="0 0 18 18" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
    <title>Close</title>
    <desc>Created with Sketch.</desc>

    <defs></defs>
    <g id="03.-Agenda" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" stroke-linecap="square">
        <g id="Filter" transform="translate(-338.000000, -22.000000)" stroke="#1A1A1A" stroke-width="4">
            <g id="Close" transform="translate(347.000000, 31.000000) rotate(-45.000000) translate(-347.000000, -31.000000) translate(339.000000, 23.000000)">
                <path d="M0,8 L16,8" id="Line-2"></path>
                <path d="M8,0 L8,16" id="Line-2"></path>
            </g>
        </g>
    </g>
</svg>