.menu li {
  float: left;
  margin-top: 12px;
  font-weight: bold;
  font-size: 14px;
  margin-left: 14px;
}

.tabs li {
  width: 221px;
  height: 137px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  text-align: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  justify-content: center;
  margin: -10% 2px 18% 0;
}

.tabs li>a {
  display: inline-block;
  padding: 20px 20px 20px 27px;
  font-size: 20px;
  font-weight: bold;
  color: #fff;
}

.history_bg {
  position: absolute;
  width: 100%;
  height: 100%;
  background: url(../images/history_bg.png) center no-repeat;
  background-size: 1500px;
  top: -100px;
  z-index: -1;
}

@media only screen and (max-width: 900px) {
  .header_keep {
    height: 60px;
  }
  .menu {
    display: none;
  }
  .logo {
    width: 95px;
    height: 60px;
    background-size: 95px;
  }
  .menu_burger, .menu_close {
    display: block;
    cursor: pointer;
    width: 20px;
    height: 20px;
    margin-top: 23px;
    background: url(../images/ic_menu_burger.png) center no-repeat;
  }
  .menu_rwd.is_open {
    display: block;
  }
  .menu_rwd {
    position: fixed;
    z-index: 999;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    -webkit-box-shadow: 0px 2px 4px 0px rgba(0, 0, 0, 0.3);
    -moz-box-shadow: 0px 2px 4px 0px rgba(0, 0, 0, 0.3);
    box-shadow: 0px 2px 4px 0px rgba(0, 0, 0, 0.3);
  }
  .menu_close {
    position: absolute;
    right: 15px;
    background: url(../images/ic_menu_close.png) center no-repeat;
  }
  .menu_rwd_box {
    text-align: center;
    padding: 20px 0;
  }
  .menu_rwd_box li {
    font-size: 18px;
    font-weight: bold;
  }
  .menu_rwd_box li>a {
    color: #003d62;
    line-height: 64px;
    display: inline-block;
    padding: 0 20px;
  }
}

.tabs li {
  background: url(../images/tabs/tab.png) top no-repeat;
}

.tabs li.active {
  background: url(../images/tabs/tab_checked.png) top no-repeat;
}

.about {
  position: relative;
  margin: -8% auto 5%;
}

.about_box {
  position: relative;
}

.about_img {
  position: absolute;
  top: -50px;
  left: -220px;
}

.about_txtarea {
  margin-left: 46%;
  font-size: 14px;
}

.about_txtarea .title {
  font-weight: bold;
  font-size: 22px;
  margin-bottom: 12px;
}

.about_txtarea .txt {
  margin-top: 12px;
}

@media only screen and (max-width: 1400px) {
  .about {
    margin: -8% auto 10%;
  }
}

@media only screen and (max-width: 1120px) {
  .about {
    margin-bottom: 2%;
  }
  .about .tab_title {
    margin-top: 5%;
  }
  .about_box {
    padding-bottom: 200px;
  }
  .about_txtarea {
    max-width: 600px;
    margin: 5% auto 3%;
  }
  .about_img {
    top: auto;
    bottom: 22px;
  }
  .about_img img {
    width: 500px;
  }
}

@media only screen and (max-width: 414px) {
  .about_txtarea .title {
    font-size: 18px;
  }
  .about_sott .about_box {
    padding-bottom: 220px;
  }
}