#header {
}
#atwiki-jp-bg1 {
    height: 200px;
    width : 100%;
    margin: 0 auto;
    background: #fff url() no-repeat center bottom;
    -webkit-background-size: 100% 300px;
    -moz-background-size: 100% 300px;
    -o-background-size: 100% 300px;
    background-size:100% 300px;
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://img.atwiki.com/image/027a/images/header.jpg', sizingMethod='scale');
    -ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='http://img.atwiki.com/image/027a/images/header.jpg', sizingMethod='scale')";
}