.flex {
    display: flex;
}
.flex_column {
    display: flex;
    flex-direction: column;
}
.center {
    display: flex;
    justify-content: center;
}
.space_between {
    display: flex;
    justify-content: space-between;
}
.main_container {
    width: 100%;
    height: 100vh;
    overflow: scroll;
    font-family:
            NotoSansJP-Thin,
            "ヒラギノ角ゴ Pro W3",
            "Hiragino Kaku Gothic Pro",
            Arial,
            "メイリオ",
            Meiryo,
            "ＭＳ ゴシック",
            sans-serif;
}
li.aside_item.list-group-item {
    padding: 0;
}
li.aside_item > a {
    padding: .75rem 1.25rem;
    display: block;
    color: inherit;
}
li.aside_item > a:hover {
    color: inherit;
    text-decoration: none;
}
@media screen and (min-width: 1980px) {
    html {
        font-size: 150%;
    }
}