#intro {
  background-image: url(../img/sub/about/bg.jpg);
}

#content .img_box {
  width: 100%;
  height: 400px;
  background-image: url(../img/sub/about/history.jpg);
  position: relative;
  background-position: center;
  background-size: cover;
}

/* ----- content start ----- */
#content .con {
  width: 100%;
  overflow: hidden;
}

.con_enter {
  display: none;
}

/* ----- year start ----- */
#content .con .year {
  margin-top: 100px;
  width: 30%;
  height: auto;
  overflow: hidden;
  float: left;
  padding-top: 40px;
  padding-left: 40px;
  padding-bottom: 40px;
  background-color: #2e77cc;
  box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.1);
}

/* 년도 클릭 시 나타나는 문구 */
#content .con .year_number {
  width: 100%;
  position: relative;
}

#content .con .year_number li {
  font-weight: 800;
  float: left;
  color: #fff;
  font-size: 3rem;
  width: 100%;
  float: left;
  line-height: 5rem;
  border-bottom: 1px solid #fff;
  margin-bottom: 10px;
}

/* 년도 클릭 시 나타나는 문구 종료 */

/* 년도 부분 */
#content .con .year_click {
  width: 100%;
  cursor: pointer;
}

#content .con .year_click ul {
  width: 100%;
}

#content .con .year_click li {
  width: 100%;
  font-size: 2rem;
  line-height: 4rem;
  color: rgba(255, 255, 255, 0.3);
}

#content .con .year_click .active {
  color: #fff;
  font-weight: 700;
}

/* ----- year end ----- */

/* ----- history start ----- */
#content .con .history {
  padding-top: 100px;
  width: 63%;
  overflow: hidden;
  float: right;
  box-sizing: border-box;
}

#content .con .boxes {
  width: 100%;
  overflow: hidden;
  position: relative;
}

#content .con .boxes img {
  max-width: 100%;
}

#content .con .boxes .m_history {
  display: none;
}

/* ----- history end ----- */
/* ----- content end ----- */

@media screen and (max-width: 1024px) {
  #content .img_box {
    height: 350px;
  }
}

@media screen and (max-width: 800px) {
  #content .con .year {
    padding-left: 20px;
    padding-top: 20px;
    padding-bottom: 20px;
  }

  #content .con .year_click li {
    line-height: 3rem;
  }

  #content .con .history {
    padding-top: 80px;
  }

  #content .con .year {
    margin-top: 80px;
  }
}

@media screen and (max-width: 720px) {
  #content .con .year,
  #content .con .history {
    width: 100%;
  }

  #content .con .year_click li {
    line-height: 4rem;
  }
}

@media screen and (max-width: 460px) {
  #content .img_box {
    height: 300px;
  }

  .w_history {
    display: none;
  }

  #content .con .boxes .m_history {
    display: block;
  }
}