@media screen and (max-width: 768px) {
  
  .content-box .content-box__img {
    min-width: 60px;
  }
  .content-box .content-box__img img {
    margin: auto;
  }

  .button-externe.bottom {
    display: block;
    margin: 30px 30px 0 30px;
  }
}