.thumb {
  width: 100%;
  height: auto;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  display: flex;
  justify-content: center;
  align-items: center;
  container-type: size;
  container-name: imagecontainer;
  
  @container imagecontainer (orientation: landscape) {
    width: auto;
    height: 100%;
  }
}