[html]

<style>
<!–
*{
margin: 0;
padding: 0;
text-align: center;
}
html{
height: 100%;
}
body{
position: relative;
height: 100%;
font-family: "ヒラギノ角ゴ Pro W3", Hiragino Kaku Gothic Pro," メイリオ", Meiryo, Osaka," ＭＳ Ｐゴシック", MS PGothic," sans-serif";
background: #eee;
}
.maintenance{
position: absolute;
left: 50%;
top: 30%;
margin-left: -300px;
width: 600px;
border: 2px solid #666;
padding: 64px 32px;
box-sizing: border-box;
background: #fff;
text-align: center;
}
.maintenance-message{
font-size: 34px;
margin-bottom: 24px;
font-weight: bold;
}
.maintenance-date{
color: #fff;
padding: 8px;
background: #cc0000;
width: 90%;
margin: 0 auto 16px;
}
–>
</style>

<div class="maintenance">
<p class="maintenance-message">ただいまメンテナンス中です</p>
<p class="maintenance-date">【メンテナンス中】</p>
<p class="maintenance-text">ご迷惑をおかけし、大変申し訳ございません。<br>
メンテナンス終了までしばらくお待ちください。</p>
</div>

[/html]