My QGIS project has multiple layers. I use a U.S. county map as my base, and higher-level layers have lines. When I use the simpleSVG plugin to export my view to an SVG, then open the file in a web browser, I only see the basemap. When I use the browser's web inspector to check the SVG file in detail, I see the SVG elements for the lines, but they appear invisible, not colored in.
What do I need to do to make QGIS export all layers with visibility?
Link to the SVG code I get when exporting only the lines: https://pastebin.com/36pnwRmZ. They appear invisible when I open the SVG file in browsers.