diff --git a/chandra/output.py b/chandra/output.py
index 173dcd8..aa430fe 100644
--- a/chandra/output.py
+++ b/chandra/output.py
@@ -30,7 +30,11 @@ def extract_images(html: str, chunks: dict, image: Image.Image):
             if not img:
                 continue
             bbox = chunk["bbox"]
-            block_image = image.crop(bbox)
+            try:
+                block_image = image.crop(bbox)
+            except ValueError:
+                # Happens when bbox coordinates are invalid
+                continue
             img_name = get_image_name(html, div_idx)
             images[img_name] = block_image
     return images
diff --git a/chandra/scripts/templates/screenshot.html b/chandra/scripts/templates/screenshot.html
index 642fe94..42dbf60 100644
--- a/chandra/scripts/templates/screenshot.html
+++ b/chandra/scripts/templates/screenshot.html
@@ -137,6 +137,7 @@
             padding: 30px;
             line-height: 1.6;
             color: #333;
+            font-size: 24px;
         }
 
         .markdown-content h1, .markdown-content h2, .markdown-content h3 {