.layout {
  display: flex;
  flex-direction: column;
}
.layout > div + div {
  margin-top: 30px;
}

@media screen and (min-width: 600px) {
  .layout {
    flex-direction: row;
  }
  .layout > div:first-child {
    width: 40%;
  }
  .layout > div + div {
    flex-grow: 1;
    margin-top: 0;
    margin-left: 3em;
  }
}

.layout > div:first-child #page-title {
  margin-bottom: 37px !important;
}
.contenu img {
  opacity: 0.1;
  margin-top: 30px;
}