.myMain {
  width: 100%;
  height: 480px; /* 高さは好みで調整 */
  margin-bottom: 10px;
}
.myMain img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.myThumbs {
  width: 100%;
  height: 100px;
}
.myThumbs img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: pointer;
  border-radius: 4px;
}