/* カスタム CSS をここに入力してください */
.header-image .site-header {
    background-position: center !important;
    background-size: 400px 150px !important;
    z-index: 9999;
}
.header-image .site-title a {
    text-align: center;
    height: 150px;
    background-size: 400px 150px !important;
    background-position: center !important;
}