.flex-gallery {
  display: flex;
  flex-wrap: wrap;
}

.image-rate {
  position: relative;
  overflow: hidden;
  height: 250px;
  margin: 2.5px;
  flex-grow: 1;
}

.image-rate img {
  width: auto;
  height: 100%;
  min-width: 100%;
  max-width: 100%;
  object-fit: cover;
  cursor: pointer;
}

.image-rate:after {
  content: '⤢';
  cursor: pointer;
  font-weight: bold;
  font-size: 28px;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: rgba(0,0,0,0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  opacity: 0;
  transition: all 300ms ease-in;
}

.image-rate:hover:after {opacity: 1}

#fullimage {
  position: fixed;
  z-index: 1002;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.8);
  cursor: -webkit-zoom-out;
  display: flex;
  justify-content: center;
  align-items: center;
}

#fullimage img {
  width: auto;
  height: auto;
  max-width: 90%;/*100 より変更2019210*/
  max-height: 90%;/*100 より変更2019210*/
}

@media (max-width: 480px) {
  .image-rate{
    width: calc(50% - 5px);
    height: calc(50vw - 5px);
  }
}