main #introduction {
  position: relative;
}

main #introduction .main-illustration {
  overflow: hidden;
  height: 450px;
  background-image: url("../../img/index_presentation.jpg");
  background-size: cover;
  background-position: 0 center;
}

main #introduction .text {
  position: absolute;
  right: 50px;
  bottom: 50px;
  background-color: #fff;
  width: 60%;
  padding: 1.5rem;
}

main #introduction .text .line {
  width: 60%;
  margin-left: 40%;
}

main #explanation {
  width: 80%;
  margin: 0 auto;
}

@media (max-width: 1399px) {
  main #introduction .main-illustration {
    height: 500px;
  }
}

@media (max-width: 1199px) {
  main #introduction .main-illustration {
    height: 540px;
  }
}

@media (max-width: 991px) {
  main #introduction .main-illustration {
    height: 580px;
  }
  main #introduction .text {
    bottom: 15px;
    left: 15px;
    right: 15px;
    width: auto;
  }
  main #explanation {
    width: 100%;
  }
}

@media (max-width: 575px) {
  main #introduction .main-illustration {
    height: 250px;
  }
  main #introduction .text {
    bottom: auto;
    left: auto;
    right: auto;
    position: initial;
    padding: 0;
    margin-top: 1.5rem;
  }
  main #introduction .text .line {
    margin-top: 1.5rem;
    margin-right: auto;
    margin-left: auto;
  }
}

@media (max-height: 850px) {
  main #introduction .main-illustration {
    height: 210px;
  }
}

@media (max-height: 700px) {
  main #introduction .main-illustration {
    height: 180px;
  }
}