.aboutnavi{
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f0f0f0;
}

.aboutnaviheader{
    width:100%;
    display: flex;
    justify-content: center;
    background-image:url("../img/background.png");
    background-size: 275px 100px;
}

.aboutnavidescription{
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 30px;
    margin-bottom: 10px;
}

.aboutnavidescription h1{
    font-size: 32px;
    font-weight: 600;
}

.aboutnavidescription p{
    font-size: 14px;
    font-weight: 400;
}

.aboutnavibody{
    width: 100%;
    display:flex;
    flex-direction: column;
    align-items: center;
}

.concept{
    width: 100%;
    background-color: #ffffff;
    display: flex;
    justify-content: center;
}

.conceptdescription{
    /* 要レスポンシブ */
    width: 900px;
    padding:10px 0;
}

.concepttitle{
    border-left: 6px double #111111;
    padding-left: 6px;
}

.concepttitle h2{
    font-size: 20px;
}

.concepttitle p{
    font-size: 9px;
}

.conceptcontent{
    margin: 10px 25px;
}

.conceptcontent p{
    font-size: 15px;
}

.conceptpicture{
    display: flex;
    justify-content: center;
}

.conceptpicture img{
    /* 要レスポンシブ */
    width: 240px;
    height: 135px;
    margin: 0 10px;
}

.music{
    width: 100%;
    display: flex;
    justify-content: center;
}

.musicdescription{
    /* 要レスポンシブ */
    width: 900px;
    padding:10px 0;
}

.musictitle{
    border-left: 6px double #111111;
    padding-left: 6px;
}

.musictitle h2{
    font-size: 20px;
}

.musictitle p{
    font-size: 9px;
}

.musiccontent{
    margin: 10px 25px;
}

.musiccontent p{
    font-size: 15px;
}

.musicbuttun{
    /* 要レスポンシブ */
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.musicbuttun a{
    text-decoration: none;
}

.musicbuttuncontent{
    display: flex;
    background-color: #111111;
    padding: 10px;
    padding-right: 14px;
    margin: 0 10px;
}

.musicbuttuncontent img{
    width: 15px;
    height: 15px;
    margin-right: 8px;
}

.musicbuttuncontent p{
    color: #ffffff;
    font-size: 15px;
    font-weight: bold;
}

.history{
    width: 100%;
    background-color: #ffffff;
    display: flex;
    justify-content: center;
}

.historydescription{
    /* 要レスポンシブ */
    width: 900px;
    padding:10px 0;
}

.historytitle{
    border-left: 6px double #111111;
    padding-left: 6px;
}

.historytitle h2{
    font-size: 20px;
}

.historytitle p{
    font-size: 9px;
}

.historycontent{
    margin: 10px 25px;
}

table{
    /* 要文字サイズ */
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
}
  
table th,table td{
    padding: 10px;
    text-align: left;
}

table th:nth-child(odd){
    width: 110px;
}
  
table tr:nth-child(odd){
    background-color: #f0f0f0
}

.aboutnavifooter{
    width: 100%;
    display: flex;
    justify-content: center;
}

.aboutdetailbuttun{
    margin-top: 30px;
    margin-bottom: 30px;
}

.aboutdetailbuttun a{
    text-decoration: none;
}

.aboutdetailbuttuncontent{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 50px;
    width: 285px;
    background:  #111111;
}

.aboutdetailbuttuncontent img{
    width: 20px;
    height: 20px;
    margin-right: 8px;
}

.aboutdetailbuttuncontent p{
    color: #ffffff;
    font-size: 15px;
    font-weight: bold;
}

footer{
    background: #f0f0f0;
}

@media screen and (max-width: 1024px) {
    .conceptdescription{
        width: calc(100% - 40px);
    }

    .musicdescription{
        width: calc(100% - 40px);
    }

    .historydescription{
        width: calc(100% - 40px);
    }

    .conceptpicture img{
        width: calc(33% - 33px);
        height: calc(19% - 19px);
        margin: 0 10px;
    }
}

@media screen and (max-width: 370px) {
    .musicbuttuncontent{
        margin: 5px 10px;
    }

    .conceptpicture img{
        width: 90%;
        height: 51%;
        margin: 10px 0;
    }

    .conceptpicture{
        flex-wrap: wrap;
    }
}