.two-column {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 2rem;
  margin: 3rem 0;
}

.two-column > div {
  flex: 1 1 0%; /* これで幅を自動調整させやすくする */
  min-width: 0;
}

@media screen and (max-width: 767px) {
  .two-column {
    flex-direction: column;
  }
  .two-column > div {
    flex: 1 1 100%;
  }
}

.two-column img {
  width: 100%;
  height: auto;
  display: block;
}