<svg width="300" height="200" class="star">
    <style>
        @import url(style.css);
    </style>
    <polygon points="100,10 40,198 190,78 10,78 160,198" />
</svg>

and "style.css"

.star {
	fill: lime;
	stroke: rgba(47, 0, 128, 0.93);
	stroke-width: 5;
	fill-rule: evenodd;
}

(based on https://www.geeksforgeeks.org/how-to-change-styles-of-svg-image-using-css/)

but When I say export plain SVG this is the resault:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
   width="300"
   height="200"
   class="star"
   version="1.1"
   id="svg1"
   xmlns="http://www.w3.org/2000/svg"
   xmlns:svg="http://www.w3.org/2000/svg">
  <defs
     id="defs1" />
  <style
     id="style1">
        @import url(style.css);
    </style>
  <polygon
     points="190,78 10,78 160,198 100,10 40,198 "
     id="polygon1" />
</svg>

It once again uses "@import url(style.css);" and not the actual CSS contant.

If posible I actualy would also like to know how to enable it on the Comand line.