#header p {
    width: 126px;
    height: auto;
    display: block;
}

#header p .logo_logomark {
    width: 100%;
    height: 38px;
    display: block;
    background-image: url(../../img/r_site-id_img03-toeic.png);
    background-size: 100% auto;
    background-repeat: no-repeat;
}