SVG でダークモード対応の favicon を作成する

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diff --git a/favicon_org.svg b/favicon.svg
index b0c5ae9..0bb7384 100644
--- a/favicon_org.svg
+++ b/favicon.svg
@@ -1,5 +1,17 @@
-<g id="svgGroup" stroke-linecap="round" fill-rule="evenodd" font-size="9pt" stroke="#000" stroke-width="0.25mm" fill="#000" style="stroke:#000;stroke-width:0.25mm;fill:#000">
+<style>
+path {
+  stroke: #222;
+  fill: #222;
+}
+@media (prefers-color-scheme: dark) {
+  path {
+    stroke: #eee;
+    fill: #eee;
+  }
+}
+</style>
+<g id="svgGroup" stroke-linecap="round" fill-rule="evenodd" font-size="9pt" stroke-width="0.25mm">