@media screen and (min-width: 768px) {
  .understand_button {
    padding: 30px 0;
    text-align: center;
    background: #e5e5e5;
    margin: 60px auto;
    width: 686px;
  }

  .understand_button p {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
  }

  .understand_button ul {
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .understand_button ul li {
    width: 40%;
    border: 1px solid #333;
    max-width: 320px;
  }

  .understand_button .understand_button_contents_02 ul li {
    width: 25%;
    border: 1px solid #333;
    max-width: 213px;
  }

  .understand_button ul li:first-child {
    margin-right: 20px;
  }

  .understand_button .understand_button_contents_02 ul li:nth-child(2) {
    margin-right: 20px;
  }

  .understand_button ul li a {
    display: block;
    height: 60px;
    line-height: 60px;
    font-size: 16px;
    color: #333;
    background: #fff;
  }

  .understand_button ul li a:hover {
    opacity: .7;
  }

  .understand_button ul li a.on {
    background: #c7c7c7;
    font-weight: bold;
  }
}

@media screen and (max-width: 767px) and (min-width: 0px) {
  .understand_button {
    padding: 8% 5%;
    margin-top: 10%;
    margin-bottom: 10%;
    text-align: center;
    background: #e5e5e5;
  }

  .understand_button p {
    font-size: 5vw;
    font-weight: bold;
    margin-bottom: 3%;
  }

  .understand_button ul {
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0;
  }

  .understand_button ul li {
    width: 48%;
    border: 1px solid #333;
  }

  .understand_button .understand_button_contents_02 ul li {
    width: 32%;
    border: 1px solid #333;
  }

  .understand_button ul li:first-child {
    margin-right: 5px;
  }

  .understand_button .understand_button_contents_02 ul li:nth-child(2) {
    margin-right: 5px;
  }

  .understand_button ul li a {
    display: block;
    height: 12vw;
    line-height: 12vw;
    font-size: 3.4vw;
    color: #333;
    background: #fff;
  }

  .understand_button ul li a.on {
    background: #c7c7c7;
    font-weight: bold;
  }
}

.view-sp {
  display: none;
}

.view-pc {
  display: block;
}

@media screen and (min-width: 0px) and (max-width: 767px) {
  .view-sp {
    display: block;
  }

  .view-pc {
    display: none;
  }
}

.understand_button_contents_02 {
  display: none;
}