diff --git a/crates/weaver-app/assets/styling/notebook-cover.css b/crates/weaver-app/assets/styling/notebook-cover.css
index 934414f..192d5d4 100644
--- a/crates/weaver-app/assets/styling/notebook-cover.css
+++ b/crates/weaver-app/assets/styling/notebook-cover.css
@@ -52,6 +52,8 @@
     height: 48px;
     min-width: 48px;
     min-height: 48px;
+    max-width: 48px;
+    max-height: 48px;
 }
 
 .notebook-cover-description {
diff --git a/crates/weaver-app/src/components/entry.rs b/crates/weaver-app/src/components/entry.rs
index 446f6c0..abea2d1 100644
--- a/crates/weaver-app/src/components/entry.rs
+++ b/crates/weaver-app/src/components/entry.rs
@@ -463,7 +463,7 @@ pub fn EntryCard(
                                 rsx! {
                                     span { class: "embed-author entry-card-author",
                                         if let Some(ref avatar_url) = profile.avatar {
-                                            img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "" }
+                                            img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "", width: "42", height: "42" }
                                         }
                                         span { class: "embed-author-info",
                                             span { class: "embed-author-name", "{display_name}" }
@@ -478,7 +478,7 @@ pub fn EntryCard(
                                 rsx! {
                                     span { class: "embed-author entry-card-author",
                                         if let Some(ref avatar_url) = profile.avatar {
-                                            img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "" }
+                                            img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "", width: "42", height: "42" }
                                         }
                                         span { class: "embed-author-info",
                                             span { class: "embed-author-name", "{display_name}" }
@@ -629,7 +629,7 @@ pub fn FeedEntryCard(
                                         to: Route::RepositoryIndex { ident: AtIdentifier::Handle(handle.clone()) },
                                         class: "embed-author entry-card-author",
                                         if let Some(ref avatar_url) = profile.avatar {
-                                            img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "" }
+                                            img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "", width: "42", height: "42" }
                                         }
                                         span { class: "embed-author-info",
                                             span { class: "embed-author-name", "{display_name}" }
@@ -646,7 +646,7 @@ pub fn FeedEntryCard(
                                         to: Route::RepositoryIndex { ident: AtIdentifier::Handle(handle.clone()) },
                                         class: "embed-author entry-card-author",
                                         if let Some(ref avatar_url) = profile.avatar {
-                                            img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "" }
+                                            img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "", width: "42", height: "42" }
                                         }
                                         span { class: "embed-author-info",
                                             span { class: "embed-author-name", "{display_name}" }
@@ -762,7 +762,7 @@ pub fn EntryMetadata(
                                                 to: Route::RepositoryIndex { ident: AtIdentifier::Handle(handle.clone()) },
                                                 class: "embed-author",
                                                 if let Some(ref avatar_url) = profile.avatar {
-                                                    img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "" }
+                                                    img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "", width: "42", height: "42" }
                                                 }
                                                 span { class: "embed-author-info",
                                                     span { class: "embed-author-name", "{display_name}" }
@@ -779,7 +779,7 @@ pub fn EntryMetadata(
                                                 to: Route::RepositoryIndex { ident: AtIdentifier::Handle(handle.clone()) },
                                                 class: "embed-author",
                                                 if let Some(ref avatar_url) = profile.avatar {
-                                                    img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "" }
+                                                    img { class: "embed-avatar", src: avatar_url.as_ref(), alt: "", width: "42", height: "42" }
                                                 }
                                                 span { class: "embed-author-info",
                                                     span { class: "embed-author-name", "{display_name}" }
diff --git a/crates/weaver-app/src/components/notebook_cover.rs b/crates/weaver-app/src/components/notebook_cover.rs
index b045cc3..9622a04 100644
--- a/crates/weaver-app/src/components/notebook_cover.rs
+++ b/crates/weaver-app/src/components/notebook_cover.rs
@@ -130,7 +130,7 @@ fn NotebookAuthor(author: weaver_api::sh_weaver::notebook::AuthorListView<'stati
             rsx! {
                 span { class: "embed-author notebook-author",
                     if let Some(ref avatar) = p.avatar {
-                        img { class: "embed-avatar", src: avatar.as_ref(), alt: "" }
+                        img { class: "embed-avatar", src: avatar.as_ref(), alt: "", width: "48", height: "48" }
                     }
                     span { class: "embed-author-info",
                         span { class: "embed-author-name", "{display_name}" }
@@ -149,7 +149,7 @@ fn NotebookAuthor(author: weaver_api::sh_weaver::notebook::AuthorListView<'stati
             rsx! {
                 span { class: "embed-author notebook-author",
                     if let Some(ref avatar) = p.avatar {
-                        img { class: "embed-avatar", src: avatar.as_ref(), alt: "" }
+                        img { class: "embed-avatar", src: avatar.as_ref(), alt: "", width: "48", height: "48" }
                     }
                     span { class: "embed-author-info",
                         span { class: "embed-author-name", "{display_name}" }
diff --git a/crates/weaver-renderer/src/atproto/embed_renderer.rs b/crates/weaver-renderer/src/atproto/embed_renderer.rs
index b4a14ff..488a8ab 100644
--- a/crates/weaver-renderer/src/atproto/embed_renderer.rs
+++ b/crates/weaver-renderer/src/atproto/embed_renderer.rs
@@ -250,7 +250,7 @@ fn render_profile_data_view(
             if let Some(avatar) = &profile.avatar {
                 html.push_str("<img class=\"embed-avatar\" src=\"");
                 html.push_str(&html_escape(avatar.as_ref()));
-                html.push_str("\" alt=\"\" />");
+                html.push_str("\" alt=\"\" width=\"42\" height=\"42\" />");
             }
             html.push_str("<span class=\"embed-author-info\">");
             if let Some(display_name) = &profile.display_name {
@@ -288,7 +288,7 @@ fn render_profile_data_view(
             if let Some(avatar) = &profile.avatar {
                 html.push_str("<img class=\"embed-avatar\" src=\"");
                 html.push_str(&html_escape(avatar.as_ref()));
-                html.push_str("\" alt=\"\" />");
+                html.push_str("\" alt=\"\" width=\"42\" height=\"42\" />");
             }
             html.push_str("<span class=\"embed-author-info\">");
             if let Some(display_name) = &profile.display_name {
@@ -573,12 +573,12 @@ fn render_author_block_inner(
             html.push_str("\" target=\"_blank\" rel=\"noopener\">");
             html.push_str("<img class=\"embed-avatar\" src=\"");
             html.push_str(&html_escape(avatar_url));
-            html.push_str("\" alt=\"\" />");
+            html.push_str("\" alt=\"\" width=\"42\" height=\"42\" />");
             html.push_str("</a>");
         } else {
             html.push_str("<img class=\"embed-avatar\" src=\"");
             html.push_str(&html_escape(avatar_url));
-            html.push_str("\" alt=\"\" />");
+            html.push_str("\" alt=\"\" width=\"42\" height=\"42\" />");
         }
     }
 
@@ -886,7 +886,7 @@ fn render_record_embed(record: &ViewUnionRecord<'_>) -> String {
             if let Some(avatar) = &generator.avatar {
                 html.push_str("<img class=\"embed-avatar\" src=\"");
                 html.push_str(&html_escape(avatar.as_ref()));
-                html.push_str("\" alt=\"\" />");
+                html.push_str("\" alt=\"\" width=\"42\" height=\"42\" />");
             }
             html.push_str("<span class=\"embed-author-info\">");
             html.push_str("<span class=\"embed-author-name\">");
@@ -927,7 +927,7 @@ fn render_record_embed(record: &ViewUnionRecord<'_>) -> String {
             if let Some(avatar) = &list.avatar {
                 html.push_str("<img class=\"embed-avatar\" src=\"");
                 html.push_str(&html_escape(avatar.as_ref()));
-                html.push_str("\" alt=\"\" />");
+                html.push_str("\" alt=\"\" width=\"42\" height=\"42\" />");
             }
             html.push_str("<span class=\"embed-author-info\">");
             html.push_str("<span class=\"embed-author-name\">");
@@ -968,7 +968,7 @@ fn render_record_embed(record: &ViewUnionRecord<'_>) -> String {
             if let Some(avatar) = &labeler.creator.avatar {
                 html.push_str("<img class=\"embed-avatar\" src=\"");
                 html.push_str(&html_escape(avatar.as_ref()));
-                html.push_str("\" alt=\"\" />");
+                html.push_str("\" alt=\"\" width=\"42\" height=\"42\" />");
             }
             html.push_str("<span class=\"embed-author-info\">");
             if let Some(name) = &labeler.creator.display_name {
@@ -1001,7 +1001,7 @@ fn render_record_embed(record: &ViewUnionRecord<'_>) -> String {
             if let Some(avatar) = &sp.creator.avatar {
                 html.push_str("<img class=\"embed-avatar\" src=\"");
                 html.push_str(&html_escape(avatar.as_ref()));
-                html.push_str("\" alt=\"\" />");
+                html.push_str("\" alt=\"\" width=\"42\" height=\"42\" />");
             }
             html.push_str("<span class=\"embed-author-info\">");
 
diff --git a/crates/weaver-renderer/src/css.rs b/crates/weaver-renderer/src/css.rs
index 0fc8705..2eb5ac4 100644
--- a/crates/weaver-renderer/src/css.rs
+++ b/crates/weaver-renderer/src/css.rs
@@ -356,10 +356,10 @@ img {{
 .embed-avatar {{
     width: 42px;
     height: 42px;
-    min-width: 42px;
-    min-height: 42px;
+    max-width: 42px;
+    max-height: 42px;
+    aspect-ratio: 1;
     margin: 0;
-    flex-shrink: 0;
     object-fit: cover;
 }}
 
@@ -617,6 +617,8 @@ a.embed-author-name:hover {{
     height: 24px;
     min-width: 24px;
     min-height: 24px;
+    max-width: 24px;
+    max-height: 24px;
 }}
 
 .embed-quote .embed-content {{