.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: 84px;
      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;
  }
}