XML/SVG/stroke

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>

Set stroke for line

<?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="50 25 200 100">
<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>