body {
    margin: 0;
    padding: 0;
    text-align: center;
    font:13px "メイリオ", "Meiryo", "Arvo", "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", sans-serif;
}
#powered_by {
    font-size: 10px
}