diff --git a/assets/css/kratos.css b/assets/css/kratos.css
index d35a8c7..3fa03e5 100644
--- a/assets/css/kratos.css
+++ b/assets/css/kratos.css
@@ -573,8 +573,8 @@ button:focus {
   float: left;
   overflow: hidden;
   margin: 20px;
-  width: 240px;
-  height: 145px;
+  width: 256px;
+  height: 144px;
 }
 
 .k-main .board .article-panel .a-thumb img {
diff --git a/inc/theme-article.php b/inc/theme-article.php
index f77adc6..bcd0890 100644
--- a/inc/theme-article.php
+++ b/inc/theme-article.php
@@ -101,12 +101,15 @@ add_filter('excerpt_length', 'excerpt_length');
 // 开启特色图
 add_theme_support("post-thumbnails");
 
+// 生成适合特色图的比例图片
+add_image_size( 'kratos-thumbnail', 512, 288, true );
+
 // 文章特色图片
 function post_thumbnail()
 {
     global $post;
     $img_id = get_post_thumbnail_id();
-    $img_url = wp_get_attachment_image_src($img_id, array(720, 435));
+    $img_url = wp_get_attachment_image_src($img_id, 'kratos-thumbnail');
     if (is_array($img_url)) {
         $img_url = $img_url[0];
     }