@media screen and (max-width: 768px) {
  main img,
  footer img {
    width: 100%;
    height: auto;
    display: block;
  }
  #avatar {
    margin-left: 0%;
  }
  .product.content {
    width: auto;
  }
  .product.img {
    display: none;
  }
  #customer {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  #customer img {
    margin: 10px 0;
  }
  footer{
    text-align: center;
  }
}

@media screen and (min-width: 768px) and (max-width: 992px) {
  main img {
    width: 100%;
    height: auto;
    display: block;
  }
  #avatar {
    margin-left: 0%;
  }
  .product.img {
    display: inline-block;
    width: 100%;
    margin: 0%;
    padding-left: 0;
  }
}