:root {
  --point-yellow: $point-yellow;
  --point-green: $point-green;
  --blue-light: $blue-light;
  --yellow-light: $yellow-light;
  --white: $white;
  --black: $black;
  --gray-dark: $gray-dark;
  --navy: $navy;
}

.history {
  margin-top: 80px;
}

.history .part h3 {
  text-align: center;
  font-size: 19px;
  color: #242424;
}

.history .part-logo {
  max-width: 222px;
  margin: 22px auto 42px;
}

.history-list {
  max-width: 1000px;
  margin: 0 auto;
}

.history-contents {
  display: flex;
  vertical-align: middle;
}

.history-contents ul {
  position: relative;
  margin: 19px 0 0 88px;
}

.history-contents ul:before {
  content: "";
  position: absolute;
  top: 20px;
  left: -44px;
  height: 100%;
  border: 1px solid rgba(0, 0, 0, 0.24);
  z-index: -1;
}

.history-contents ul:after {
  content: "";
  position: absolute;
  top: 3px;
  left: -53px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #3D6B70;
}

.history-contents.start ul:before {
  display: none;
}

.history-contents li {
  display: flex;
  gap: 40px;
  margin: 0 0 24px;
}

.history-contents li div {
  flex: 2;
}

.history-contents .year {
  font-size: 36px;
  font-weight: 700;
  color: #F99D1C;
}

.history-contents .month {
  text-align: right;
  width: 40px;
  font-size: 16px;
  font-weight: 700;
  color: rgba(0, 0, 0, 0.87);
}

@media (max-width: 720px) {
  .history-contents {
    flex-direction: column;
  }
  .history-contents ul {
    margin: 0;
  }
  .history-contents ul:before {
    display: none;
  }
  .history-contents ul .month {
    text-align: left;
  }
}