main header .line {
  margin-right: auto;
  margin-left: auto;
  width: 50%;
}

main section#explanations a {
  display: table;
  margin-left: auto;
  margin-right: auto;
}

main section#explanations a > .illustrations {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: center;
}

main section#explanations a > .illustrations img {
  height: 150px;
  box-shadow: 0 4px 20px #e7e7e7;
  transition: transform 0.25s ease-in-out, box-shadow 0.25s ease-in-out;
}

main section#explanations a > .illustrations img:hover {
  transform: rotate(-7deg);
  box-shadow: 0 4px 20px rgba(148, 198, 108, 0.75);
}