diff --git a/README.md b/README.md
index 81aa4ea..9d45efb 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 # at-astro-loader
+
 [![NPM Package][npm-img]][npm-url]
 [![Bundle Size][size-img]][size-url]
 [![Build Status][build-img]][build-url]
diff --git a/oxfmt.config.ts b/oxfmt.config.ts
index 855f14f..c26fe32 100644
--- a/oxfmt.config.ts
+++ b/oxfmt.config.ts
@@ -2,5 +2,5 @@ import { defineConfig } from "oxfmt"
 
 export default defineConfig({
   semi: false,
-  ignorePatterns: ["./src/lexicons/**/*", "./lexicons/**/*"],
+  ignorePatterns: ["src/lexicons/**/*", "lexicons/**/*"],
 })
diff --git a/src/renderers/offprint.ts b/src/renderers/offprint.ts
index 89f5605..33a80be 100644
--- a/src/renderers/offprint.ts
+++ b/src/renderers/offprint.ts
@@ -186,6 +186,10 @@ function imageGridAspectRatioStyle(aspectRatio?: "landscape" | "portrait" | "squ
       return "aspect-ratio:3/4"
     case "square":
       return "aspect-ratio:1/1"
+    case "mosaic":
+      return "aspect-ratio:4/3"
+    case undefined:
+      return "aspect-ratio:4/3"
     default:
       return "aspect-ratio:4/3"
   }
@@ -201,7 +205,9 @@ function renderGridImages(images: ImageLike[], opts: StandardSiteDocumentRendere
         "width:100%",
         "height:100%",
         "object-fit:cover",
-        image.aspectRatio ? `aspect-ratio:${image.aspectRatio.width}/${image.aspectRatio.height}` : undefined,
+        image.aspectRatio
+          ? `aspect-ratio:${image.aspectRatio.width}/${image.aspectRatio.height}`
+          : undefined,
       ].filter((style) => !!style)
       const style = ` style="${styles.join(";")}"`
       if (!src) return `<div class="image-grid-item"${style}></div>`