.square {
  position: relative;
  overflow: hidden;
  width: 100%; /* 必要に応じて調整 */
  aspect-ratio: 1 / 1; /* これを追加 */
}
.square:before {
  content: "";
  display: block;
  padding-top: 100%;
}
.column-grid .list .square .overlay,
.assistance_item li .square .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.column-grid .list .square .overlay .sub-img,
.assistance_item li .square .overlay .sub-img {
  opacity: 0;
}
.column-grid .list .square .overlay:hover .sub-img,
.assistance_item li .square .overlay:hover .sub-img {
  opacity: 1;
}
.square img {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  /*max-width: 100%;
  max-height: 100%;*/
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.section-home.widget_welcart_bestseller .rankimg {
  z-index: 1;
}