.banner {
  height: 600px;
  background: url(../img/banner.jpg) no-repeat top center;
  background-size: cover;
  padding-top: 80px;
}

header {
  position: absolute;
  width: 100%;
  background-color: transparent;
}

.activity-info {
  padding-top: 70px;
}

.activity-info .slogan {
  color: #fff;
  font-size: 60px;
  line-height: 80px;
}

.date-address {
  display: flex;
  font-size: 16px;
  color: #fff;
  margin-top: 50px;
  margin-bottom: 40px;
}

.date-address .date {
  border-right: 1px solid #fff;
  padding-right: 30px;
  margin-right: 20px;
}

.date-address > div > div:first-child {
  margin-bottom: 10px;
}

.btn {
  display: inline-block;
  width: 180px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  color: #fff;
  font-size: 16px;
  border-radius: 6px;
}

.btn.btn-blue {
  background-color: #3a9efd;
}

.btn.btn-red {
  background-color: #ef4564;
}

.section {
  margin-top: 20px;
}

.section-1 {
  display: flex;
}

.section-1 .info-box:first-child {
  width: 747px;
  flex-shrink: 0;
  flex-grow: 0;
  margin-right: 20px;
}

.section-3 {
  display: flex;
  justify-content: space-between;
}

.section-3 .info-box {
  width: calc(50% - 15px);
}

@media screen and (max-width: 1200px) {
  .banner {
    padding-top: 50px;
  }

  .btn {
    width: 80px;
    height: 30px;
    line-height: 30px;
    color: #fff;
    font-size: 12px;
    border-radius: 4px;
  }

  .banner {
    height: 300px;
  }

  .activity-info {
    padding-top: 20px;
  }

  .activity-info .slogan {
    font-size: 24px;
    line-height: 1.4;
  }

  .activity-info .date-address {
    margin-top: 20px;
    margin-bottom: 20px;
    font-size: 12px;
  }

  .date-address .date {
    padding-right: 20px;
    margin-right: 10px;
  }

  .section-1 {
    flex-direction: column;
  }

  .section-1 .info-box:first-child {
    width: 100%;
    flex-shrink: 0;
    flex-grow: 0;
    margin-right: 0;
  }

  .section-3 {
    display: block;
  }

  .section-3 .info-box {
    width: 100%;
  }
}