diff --git a/Userland/Libraries/LibWeb/HTML/SyntaxHighlighter/SyntaxHighlighter.cpp b/Userland/Libraries/LibWeb/HTML/SyntaxHighlighter/SyntaxHighlighter.cpp
index cae5183436..44e5b74c39 100644
--- a/Userland/Libraries/LibWeb/HTML/SyntaxHighlighter/SyntaxHighlighter.cpp
+++ b/Userland/Libraries/LibWeb/HTML/SyntaxHighlighter/SyntaxHighlighter.cpp
@@ -7,6 +7,7 @@
 
 #include <AK/Debug.h>
 #include <LibJS/SyntaxHighlighter.h>
+#include <LibWeb/CSS/SyntaxHighlighter/SyntaxHighlighter.h>
 #include <LibWeb/HTML/Parser/HTMLTokenizer.h>
 #include <LibWeb/HTML/SyntaxHighlighter/SyntaxHighlighter.h>
 
@@ -102,7 +103,21 @@ void SyntaxHighlighter::rehighlight(Palette const& palette)
                     spans.extend(proxy_client.corrected_spans());
                     substring_builder.clear();
                 } else if (state == State::CSS) {
-                    // FIXME: Highlight CSS code here instead.
+                    Syntax::ProxyHighlighterClient proxy_client {
+                        *m_client,
+                        substring_start_position,
+                        static_cast<u64>(AugmentedTokenKind::__Count) + first_free_token_kind_serial_value(),
+                        substring_builder.string_view()
+                    };
+                    {
+                        CSS::SyntaxHighlighter highlighter;
+                        highlighter.attach(proxy_client);
+                        highlighter.rehighlight(palette);
+                        highlighter.detach();
+                        register_nested_token_pairs(proxy_client.corrected_token_pairs(highlighter.matching_token_pairs()));
+                    }
+
+                    spans.extend(proxy_client.corrected_spans());
                     substring_builder.clear();
                 }
                 state = State::HTML;