diff --git a/broadcast/index.frm.php b/broadcast/index.frm.php
index 505c351..43e50db 100644
--- a/broadcast/index.frm.php
+++ b/broadcast/index.frm.php
@@ -2,13 +2,14 @@
 <html lang="ja">
     <head>
         <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
         <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous" />
         <title>伊地知ニジカ放送局 - ニジカ返答ログ</title>
     </head>
 
     <body>
         <?php foreach (array_reverse ($log_data) as $record): ?>
-        <div style="margin-bottom: 24px">
+        <div class="mb-4">
             <div>
                 <?= $record['date_time'] ?>
             </div>
