.img-small {
    width: 400px;
}
.img-medium {
    width: 60%;
}
.img-center {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.img-left {
  display: block;
  margin: 1rem 0;
  max-width: 40%;
  text-align: left;
}