style update

Html/apps/static/css/chatbox_approve_icon.css

@@ -14,8 +14,8 @@
     flex-grow: 1;
   }
   
-  /* 右边批准按钮 */
-  .approve-button {
+/* 右边批准按钮 */
+.approve-button {
     width: 40px;
     height: 40px;
     border-radius: 50%;
@@ -26,6 +26,11 @@
     border: none;
     flex-shrink: 0; /* 保证按钮不被压缩 */
     transition: background-color 0.3s ease, transform 0.2s ease;
+    
+    /* Flexbox 居中对勾 */
+    display: flex;
+    justify-content: center;
+    align-items: center;
   }
   
   /* 鼠标悬停时改变按钮颜色 */