修改用户头像样式

src/components/layout/header.vue

@@ -101,11 +101,7 @@ export default {
     height: 40px;
     border-radius: 50%;
     overflow: hidden;
-    img {
-      width: 100%;
-      height: 100%;
-      object-fit: cover;
-    }
+    object-fit: cover;
   }
   .user-name {
     padding: 0 10px;