.header {
    position: fixed; /* ヘッダーの固定 */
    top: 0;
    width: 100%;
    height: 40px;
    background-color: #454545;
    color: white;
    text-align: center;
    display: flex;
}

.header-logo {
    width: 50px;
    height: 35px;
    margin-left: 20px;
    margin-right: 10px;
}

.header-logo img {
    width: 100%;
    height: auto;
}

.header-title button {
    width: 180px;
    height: 40px;
    color: white;
    background-color: #454545;
    border: none;
    font-size: 25px;
    font-family: "游明朝", YuMincho, "ヒラギノ明朝 ProN", "Hiragino Mincho ProN", "MS P明朝", "MS 明朝", serif;
}

.menulist {
    width: 260px;
    margin: 0 0 0 auto;
    display: flex;
}

.menulist button {
    width: 125px;
    height: 35px;
    margin: 2px;
    background-color: #606060;
    border-radius: 5px;
    color: white;
    font-size: 15px;
}

.menulist button:hover {
    background-color: #454545;
}

/* モバイル版のCSS */
@media (max-width: 768px) {
    .header {
        height: 35px;
    }

    .header-logo {
        margin-left: 10px;
        margin-right: 0px;
    }

    .header-title button {
        width: 120px;
        height: 35px;
        font-size: 15px;
    }

    /* ヘッダーのメニューバー */
    .menulist {
        width: 170px;
    }

    /* ヘッダーのボタン */
    .menulist button {
        width: 70px;
        height: 30px;
        font-size: 10px;
    }
}