diff --git a/partials/post-card.hbs b/partials/post-card.hbs
index 35dfabfd..4d2aae8c 100644
--- a/partials/post-card.hbs
+++ b/partials/post-card.hbs
@@ -9,7 +9,7 @@
                             {{img_url feature_image size="l" format="webp"}} 960w,
                             {{img_url feature_image size="xl" format="webp"}} 1200w,
                             {{img_url feature_image size="xxl" format="webp"}} 2000w"
-                    sizes="{{#if imageSizes}}{{imageSizes}}{{else}}320px{{/if}}"
+                    sizes="{{#if imageSizes}}{{imageSizes}}{{else}}{{#if lazyLoad}}auto, (max-width: 1199px) 100vw, 980px{{else}}320px{{/if}}{{/if}}"
                     src="{{img_url feature_image size="m"}}"
                     alt="{{#if feature_image_alt}}{{feature_image_alt}}{{else}}{{title}}{{/if}}"
                     {{#if lazyLoad}}loading="lazy"{{/if}}