Add theme: Zen Letterbox

themes/c0c32823-2b49-4693-8ce3-5a66212ea501/chrome.css

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+
+#browser {
+  --zen-element-separation: calc(6px * var(--letterbox-multiply-factor, 3)) !important;
+}

themes/c0c32823-2b49-4693-8ce3-5a66212ea501/preferences.json

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+[
+    {
+        "property": "letterbox.multiply-factor",
+        "label": "Multiply Factor (number)",
+        "type": "string",
+        "defaultValue": "3",
+        "placeholder": "0.5, 1, 2, ..."
+    }
+]

themes/c0c32823-2b49-4693-8ce3-5a66212ea501/readme.md

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+
+# Zen Letterbox
+A simple way to change the width of the letterbox.

themes/c0c32823-2b49-4693-8ce3-5a66212ea501/theme.json

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+{
+    "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"
+}