@media (max-width: 750px) {
  .monthly__txt__img-wrap .monthly__txt__img:first-child {
    max-width: 70%;
    margin-left: auto;
    margin-right: auto;
  }
}

@media (min-width: 751px) {
  .monthly__txt__img-wrap .monthly__txt__img:last-child {
    max-width: 390px;
  }
}