diff --git a/pkg/warc/internal/archiver/processor.go b/pkg/warc/internal/archiver/processor.go
index 0b122f19..e47ebd83 100644
--- a/pkg/warc/internal/archiver/processor.go
+++ b/pkg/warc/internal/archiver/processor.go
@@ -404,6 +404,7 @@ func processCSS(input io.Reader, baseURL *nurl.URL) (string, []ResourceURL) {
 		// Save the CSS URL and replace it with archival URL
 		res := ToResourceURL(cssURL, baseURL)
 		if res.ArchivalURL == "" {
+			buffer.Write(bt)
 			continue
 		}
 
diff --git a/pkg/warc/internal/archiver/resource-url.go b/pkg/warc/internal/archiver/resource-url.go
index fdf69a6d..606223a6 100644
--- a/pkg/warc/internal/archiver/resource-url.go
+++ b/pkg/warc/internal/archiver/resource-url.go
@@ -31,12 +31,30 @@ func ToResourceURL(uri string, base *nurl.URL) ResourceURL {
 		return ResourceURL{}
 	}
 
-	// Create archive URL
+	// Create download URL
 	downloadURL := toAbsoluteURI(uri, base)
 	downloadURL = rxTrailingSlash.ReplaceAllString(downloadURL, "")
 	downloadURL = strings.ReplaceAll(downloadURL, " ", "+")
 
-	archivalURL := strings.Replace(downloadURL, "://", "/", 1)
+	// Create archival URL
+	archivalURL := downloadURL
+
+	// Some URL have its query escaped.
+	// For example, Wikipedia's stylesheet looks like this :
+	//   load.php?lang=en&modules=ext.3d.styles%7Cext.cite.styles%7Cext.uls.interlanguage
+	// However, when browser download it, it will be registered as unescaped query :
+	//   load.php?lang=en&modules=ext.3d.styles|ext.cite.styles|ext.uls.interlanguage
+	// So, for archival URL, we need to unescape the query first.
+	tmp, err := nurl.Parse(downloadURL)
+	if err == nil {
+		newQuery, _ := nurl.QueryUnescape(tmp.RawQuery)
+		if newQuery != "" {
+			tmp.RawQuery = newQuery
+			archivalURL = tmp.String()
+		}
+	}
+
+	archivalURL = strings.Replace(archivalURL, "://", "/", 1)
 	archivalURL = strings.ReplaceAll(archivalURL, "?", "-")
 	archivalURL = strings.ReplaceAll(archivalURL, "#", "-")
 	archivalURL = strings.ReplaceAll(archivalURL, "/", "-")