diff --git a/www/assets/favicon.svg b/www/assets/favicon.svg
index e42c614..e4f41d0 100644
--- a/www/assets/favicon.svg
+++ b/www/assets/favicon.svg
@@ -9,9 +9,9 @@
    inkscape:version="1.4.2 (ebf0e940d0, 2025-05-08)"
    width="1024"
    height="1024"
-   inkscape:export-filename="favicon.png"
-   inkscape:export-xdpi="63.246807"
-   inkscape:export-ydpi="63.246807"
+   inkscape:export-filename="icon-512.png"
+   inkscape:export-xdpi="48"
+   inkscape:export-ydpi="48"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns="http://www.w3.org/2000/svg"
@@ -29,11 +29,11 @@
      inkscape:deskcolor="#d1d1d1"
      showgrid="false"
      inkscape:zoom="0.70710681"
-     inkscape:cx="673.87273"
+     inkscape:cx="672.45852"
      inkscape:cy="533.15849"
      inkscape:current-layer="レイヤー_1"
-     inkscape:window-width="1874"
-     inkscape:window-height="966"
+     inkscape:window-width="1920"
+     inkscape:window-height="1080"
      inkscape:window-x="0"
      inkscape:window-y="0"
      inkscape:window-maximized="1" /><defs
diff --git a/www/assets/icon-512.png b/www/assets/icon-512.png
new file mode 100644
index 0000000..54a4dcf
Binary files /dev/null and b/www/assets/icon-512.png differ