body {
    background: #fff;
}

body, div, span, td {
    margin: 0;
    padding: 0;
    font-family: "Noto Sans JP", "Avenir", sans-serif, "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro",Lucida Grande,"メイリオ", Meiryo, Tahoma, Verdana, Osaka, "ＭＳ Ｐゴシック", "MS PGothic";    
    font-size: 14px;
    color: #000;
}

a {
    color: #000;
}
a:visited {
    color: #000;
}

.top_pc {
    z-index: 2;
    position: relative;
    width:800px;
    margin: 0 auto;
}
.top_sp {
    z-index: 2;
    position: relative;
    width:90%;
    display: none;
    margin: 0 auto;
}
@media screen and (max-width: 880px) {
    .top_pc {
        width: 90%;
    }
}
@media screen and (max-width: 600px) {
    .top_pc {
        display: none;
    }
    .top_sp {
        display: block;
    }
}

.introduction_root {
    width:800px;
    margin: 160px auto 0 auto;
}
@media screen and (max-width: 880px) {
    .introduction_root {
        width: 90%;
    }
}

.footer {
    width:800px;
    margin: 0 auto;
}
@media screen and (max-width: 880px) {
    .footer {
        width: 90%;
    }
}