diff --git a/CHDataManagement/Generator/ImageSet.swift b/CHDataManagement/Generator/ImageSet.swift
index e635f85..f0b5c65 100644
--- a/CHDataManagement/Generator/ImageSet.swift
+++ b/CHDataManagement/Generator/ImageSet.swift
@@ -52,13 +52,13 @@ struct ImageSet: HtmlProducer {
         let prefix1x = "/\(image.outputImageFolder)/\(maxWidth)x\(maxHeight)"
         let prefix2x = "/\(image.outputImageFolder)/\(maxWidth*2)x\(maxHeight*2)"
 
-        let imageSize = (image.getImageDimensions()?.scaledToFit(in: .init(width: maxWidth, height: maxHeight)))
-            .map { " width='\(Int($0.width))' height='\(Int($0.height))'" }
+        let aspectRatio = (image.getImageDimensions()?.scaledToFit(in: .init(width: maxWidth, height: maxHeight)))
+            .map { " aspect-ratio='\(Int($0.width)) / \(Int($0.height))'" }
 
         result += "<picture>"
         result += "<source type='image/avif' srcset='\(prefix1x).avif 1x, \(prefix2x).avif 2x'/>"
         result += "<source type='image/webp' srcset='\(prefix1x).webp 1x, \(prefix1x).webp 2x'/>"
-        result += "<img srcset='\(prefix2x)\(fileExtension) 2x' src='\(prefix1x)\(fileExtension)'\(imageSize ?? "") loading='lazy'\(imageAltText)\(extraAttributes)/>"
+        result += "<img srcset='\(prefix2x)\(fileExtension) 2x' src='\(prefix1x)\(fileExtension)'\(aspectRatio ?? "") loading='lazy'\(imageAltText)\(extraAttributes)/>"
         result += "</picture>"
     }
 }