diff --git a/apps/web/src/pages/ai-avatar/AiAvatar.css b/apps/web/src/pages/ai-avatar/AiAvatar.css
index 1ebf148a6..7e5e1fbe9 100644
--- a/apps/web/src/pages/ai-avatar/AiAvatar.css
+++ b/apps/web/src/pages/ai-avatar/AiAvatar.css
@@ -549,21 +549,23 @@
 /* ── 封面 & 生成 ── */
 .aa-cover-preview {
   width: 100%;
+  max-width: 240px;
   aspect-ratio: 9/16;
-  max-height: 160px;
   background: #f0f0f5;
-  border-radius: 10px;
+  border-radius: 8px;
   overflow: hidden;
   display: flex;
   align-items: center;
   justify-content: center;
-  margin-bottom: 12px;
+  margin: 0 auto 12px auto;
+  position: relative;
 }
 
 .aa-cover-preview img {
   width: 100%;
   height: 100%;
   object-fit: cover;
+  display: block;
 }
 
 .aa-cover-preview__placeholder {