添加半透明卡片

index.html

@@ -9,6 +9,7 @@
     <link rel="stylesheet" href="css/chat.css">
     <link rel="stylesheet" href="css/font.css">
     <link rel="stylesheet" href="css/time.css">
+    <link rel="stylesheet" href="css/tool_card.css">
     <link rel="stylesheet" href="css/max_width.css">
 </head>
 
@@ -36,9 +37,11 @@
 
         <!-- 右侧内容 -->
         <div class="right-panel">
-            <div class="datetime">
-                <div id="timeDisplay" class="time">--:--:--</div>
-                <div id="dateDisplay" class="date">加载中...</div>
+            <div class="tool-card">
+                <div class="datetime">
+                    <div id="timeDisplay" class="time">--:--:--</div>
+                    <div id="dateDisplay" class="date">加载中...</div>
+                </div>
             </div>
             <div class="future-content">
                 <p>此处预留未来内容</p>