/* paragraphes alternés */
p:nth-of-type(2n+1) {
  margin-left: 30%;
}

/* sauf paragraphe d'intro */
p:nth-of-type(1){
  margin-left: 0%;
}

p:nth-of-type(2n) {
  margin-right: 30%;
}

h3:nth-of-type(2n) {
  margin-left: 30%;
}

li {
  list-style: none;
}


@media (max-width: 900px) {
  p:nth-of-type(2n+1) {
    margin-left: 0%;
  }

  p:nth-of-type(2n) {
    margin-right: 0%;
  }

  h3:nth-of-type(2n) {
    margin-left: 0%;
  }
}