DEV code snippets: simple SVG 100 px coos

<svg
    height="100%"
    width="100%"
    version="1.1"
    viewBox="-50 -50 100 100"
    xmlns="http://www.w3.org/2000/svg"
    xmlns:xlink="http://www.w3.org/1999/xlink">
    <defs>
    </defs>
    <g>
        <rect
        x="-50"
        y="-50"
        width="100"
        height="100"
        style="fill:rgb(0,0,0);opacity:0.5"/>
        <line
            style="stroke:rgb(0,0,0);stroke-width:1"
            x1="-50"
            y1="0"
            x2="50"
            y2="0"/>
        <line
            style="stroke:rgb(0,0,0);stroke-width:1"
            x1="0"
            y1="-50"
            x2="0"
            y2="50"/>
    </g>
</svg>