header {
   text-align: center;
   width: 100%;
   height: auto;
}
header img {
  width: 100%;
  height: auto;
}
h1 {
  color: rgb(161, 187, 216);
  font-size: 6.0rem;
  margin-top: 1rem;
  margin-bottom: 1rem;
}
h2 {
  margin-top: 50px;
  margin-bottom: 10px;
}
.content {
    color: rgb(114, 137, 163);
    max-width: 1400px;
    margin: auto;
    text-align: left;
    font-size: 1.4rem;
    font-family: 'Courier New', Courier, monospace;
}
.a_button {
  background-color: rgb(114, 137, 163);
  padding: 5px 10px 5px 10px;
  border-radius: 10px;
}
.a_button:link {
    text-decoration: none;
    color: #ffffff;
}
.a_button:visited {
    color: #ffffff;
}
.a_button:active {
    color: #ffffff;
}
.a_button:hover {
    color: #1e1e1e;
}
.a_icone {
  width: 10%;
  min-width: 30px;
  max-width: 60px;
  height: auto;
}
.presentation {
  width: 100%;
  margin: auto;
}
.box {
    display: flex;
    width: 100%;
    max-width: 100%;
    gap: 5px;
}
.box_image {
    flex: 1 1 0%;
}
.image {
  width: 100%;
  height: auto;
  object-fit: cover;
}
.links {
  text-align: center;
  margin-top: 3rem;
  margin-bottom: 3rem;
}
.illustrations {
  background-color: #f2f2f2;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: auto;
}
.illustrations > img {
  object-fit: cover;
  width: 100%;
  max-height: 100%;
}
footer {
  width: 100%;
  height: auto;
  color: rgb(114, 137, 163);
  text-align: center;
  font-size: 0.8rem;
  margin-top: 3rem;
}

@media (max-width: 600px) {
  h1 {
    font-size: 3.0rem;
  }
  .content {
    font-size: 1rem;
  }
  .illustrations {
    grid-template-columns: 1fr;
    padding: 0px;
    gap: 0px;
  }
}

@media (min-width: 601px) and (max-width: 1000px) {
  .illustrations {
    grid-template-columns: 1fr 1fr;
    padding: 0px;
    gap: 0px;
  }
}