.about__img {
  float: right;
  margin-left: 2.5rem;
  margin-bottom: 1rem;
  width: 100%;
  height: auto;
  max-width: 35rem;
}

@media only screen and (max-width: 740px) {
  .about__img {
    float: none;
    display: block;
    margin-left: auto;
    margin-right: auto;
  }
}