Set stroke color and width
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20001102//EN"
"http://www.w3.org/TR/2000/CR-SVG-20001102/DTD/svg-20001102.dtd">
<svg width="800" height="400" viewBox="0 0 200 100">
<g>
<rect style="fill:red;"
x="0" y="0" width="100" height="50"/>
<line x1="0" y1="24" x2="100" y2="24"
style="stroke:white;stroke-width:2"/>
<line x1="49" y1="0" x2="49" y2="50"
style="stroke:white;stroke-width:2"/>
</g>
</svg>
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