Paste in the terminal with the svg open, then inspector -> view as HTML and copy result out

fixsvg.js

classMap = {}
var rules = document.styleSheets[0].cssRules // 1. get first stylesheet
for (var j = 0; j < rules.length; j++) { // 2. loop over all rules
  var selector = rules[j].selectorText
  var csstext = rules[j].cssText
  classMap[selector.replace(".", "")] = csstext.split("{")[1].replace("}", "") // 3. save class name and rule text to mapper object
}

document.querySelectorAll("rect,path,polygon,image").forEach(function(item, index) { // 4. loop over all rects
  var style = ""
  item.classList.forEach(function(className) { // 5. loop over all class names
    style += classMap[className] // 6. + 7. get style rules form mapper and concat
  })
  item.removeAttribute("class") // 8. remove class
  item.setAttribute("style", style) // 9. add inline style
})