.carre-contenu {
  border-right: 1px solid white;
  border-bottom: 1px solid white;
  padding: 50px;
  margin-bottom: 20px;
}

.carre-contenu h2 {
  margin-top: 30px;
}

.carre-contenu ul {
  margin-top: 30px;
}

.carre-contenu + div {
  text-align: center;
}
.carre-contenu p {
  text-align: justify;
}
.a-propos-main {
  width: 50%;
  margin: auto;
}
h2 {
  margin-bottom: 80px;
}

h1,
h2 {
  text-align: center;
}
  @media screen and (max-width: 996px) {
    .a-propos-main {
    padding-top: 50px;
    width:100%;
    margin:0;
    }
    section {
      padding: 50px 0px 50px 0px;
    }
    .a-propos-main {
        margin-top: 15px;
    }
    .carre-contenu {
      margin-right: 15px;
    }
    }