Page looks unstyled.
CSS didn't load.
Everything looked fine locally but the live site has no styles. The stylesheet is either missing from the deploy folder or the path in your HTML is wrong.
Find it in 30 seconds
F12 → Network tab → look for your .css file in the list. If it's red (404), the file isn't on the server. If it's missing entirely, the <link> tag path is wrong or the file was never copied.
Common causes & fixes
The CSS file wasn't copied into _site/. Add css (or wherever it lives) to your build script copy list.
Check the href in your <link> tag. Use an absolute path like /styles.css not a relative one like ../styles.css.
Relative paths break on nested pages. Switch all stylesheet links to root-relative paths starting with /.
Hard refresh: Ctrl+Shift+R (or Cmd+Shift+R on Mac). If that fixes it, it was browser cache not a real bug.
Verify the file made it into your build output:
# Check if CSS exists in your build output: ls -la _site/ ls -la _site/css/ ls -la _site/styles.css