diff --git a/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/chrome.css b/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/chrome.css
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+
+#browser {
+  filter: grayscale(100%);
+}
diff --git a/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/image.png b/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/image.png
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diff --git a/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/readme.md b/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/readme.md
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+
+# Grayscale Theme
+
+Grayscale theme for zen browser. Does not hide extension popup color.
+
+## Preview
+
+![preview](https://raw.githubusercontent.com/Erl-koenig/zen-grayscale/refs/heads/main/preview.png)
diff --git a/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/theme.json b/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/theme.json
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+{
+    "id": "4ef75ef2-b751-45f6-ab65-e0baf7b60568",
+    "name": "Grayscale",
+    "description": "Applies a grayscale filter to the browser.",
+    "homepage": "https://github.com/Erl-koenig/zen-grayscale",
+    "style": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/chrome.css",
+    "readme": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/readme.md",
+    "image": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/4ef75ef2-b751-45f6-ab65-e0baf7b60568/image.png",
+    "author": "Erl-koenig",
+    "version": "1.0.0",
+    "tags": [],
+    "createdAt": "2025-05-06",
+    "updatedAt": "2025-05-06"
+}
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