diff --git a/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/chrome.css b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/chrome.css
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--- /dev/null
+++ b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/chrome.css
@@ -0,0 +1,4 @@
+
+#browser {
+  --zen-element-separation: calc(6px * var(--letterbox-multiply-factor, 3)) !important;
+}
diff --git a/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/image.png b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/image.png
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diff --git a/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/preferences.json b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/preferences.json
new file mode 100644
index 00000000..0d99d7bf
--- /dev/null
+++ b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/preferences.json
@@ -0,0 +1,9 @@
+[
+    {
+        "property": "letterbox.multiply-factor",
+        "label": "Multiply Factor (number)",
+        "type": "string",
+        "defaultValue": "3",
+        "placeholder": "0.5, 1, 2, ..."
+    }
+]
\ No newline at end of file
diff --git a/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/readme.md b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/readme.md
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index 00000000..d44f93bb
--- /dev/null
+++ b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/readme.md
@@ -0,0 +1,3 @@
+
+# Zen Letterbox
+A simple way to change the width of the letterbox.
diff --git a/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/theme.json b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/theme.json
new file mode 100644
index 00000000..5672a1ce
--- /dev/null
+++ b/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/theme.json
@@ -0,0 +1,15 @@
+{
+    "id": "c0c32823-2b49-4693-8ce3-5a66212ea501",
+    "name": "Zen Letterbox",
+    "description": "A simple way to change the width of the letterbox.",
+    "homepage": "",
+    "style": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/chrome.css",
+    "readme": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/readme.md",
+    "image": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/image.png",
+    "author": "p-sw",
+    "version": "1.0.0",
+    "tags": [],
+    "createdAt": "2025-02-26",
+    "updatedAt": "2025-02-26",
+    "preferences": "https://raw.githubusercontent.com/zen-browser/theme-store/main/themes/c0c32823-2b49-4693-8ce3-5a66212ea501/preferences.json"
+}
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