.history_block{
  position: relative;
}
.history_block:before{
  content: "";
  position: absolute;
  background: #806600;
  background: linear-gradient(180deg,rgba(128, 102, 0, 0.6) 0%, rgba(128, 102, 0, 0.6) 0%, rgba(128, 102, 0, 0.6) 90%, rgba(255, 255, 255, 1) 100%);
  width: 5px;
  height: 99%;
  top: 34px;
  left: 12px;
}
.history_block_innner{
  position: relative;
  padding-left: 40px;
}
.history_block_innner .about-history_tit2::before{
  position: absolute;
  top: 26px;
  left: 3px;
  content: '●';
  color: #806600;
  font-size: 2.4rem;
  line-height: 1;
}


@media screen and (max-width: 767px) {
  .history_block:before{
    content: "";
    position: absolute;
    width: 5px;
    height: 99%;
    top: 30px;
    left: 1em;
  }
  .history_block_innner{
    padding-left: 30px;
  }
  .history_block_innner .about-history_tit2::before{
    position: absolute;
    top: 16px;
    left: 3px;
    content: '●';
    color: #806600;
    font-size: 1.8rem;
  }
}