.main-menu {
    top: 70px;
    background: #f7f7f7;
}

.main-menu__link button {
    text-align: left;
}

.main-sub-menu {
    padding: 0;
}

.main-sub-menu__container {
    padding: 20px 0;
    background-color: #f1f1f1;
}

.main-sub-menu__grid {
    max-width: 820px;
    margin: 0 auto;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

/* thumbmail */
.sub-menu__link {
    width: 190px;
    max-height: 220px;
    line-height: 1.8rem;
    margin-bottom: 15px;
}

.sub-menu__thumbmail {
    width: 180px;
    height: 150px;
}

@media (min-width: 768px) {
    .main-menu {
        padding-left: 0;
        background: transparent;
        height: 66px;
    }

    .main-menu__link {
        background-color: transparent;
        transition: background-color ease-in-out .3s;
    }

    .main-menu__link > button,
    .main-menu__link > a {
        line-height: 4rem;
        font-weight: 600;
    }

    .main-menu__link.is-active:not(.is-open) > button,
    .main-menu__link.is-active:not(.is-open) > a {
        border-bottom: 5px solid;
    }

    .main-sub-menu {
        top: 102px;
        background-color: rgba(0, 0, 0, .85);
    }

    .main-sub-menu__container {
        position: absolute;
        left: 0;
        right: 0;
    }
}

@media (min-width: 992px) {
    .main-menu__link {
        padding: 0 20px;
    }
}