<div class="expand">
  <img src="https://katsu-dev.netlify.app/icons/icon-96x96.png" alt="アイコン画像"> 
</div>
.expand {
  width: 150px;
  border: 3px solid gold;
}
.expand img {
  width: 100%;
  height: auto;
  vertical-align: top;
  transition: transform 0.5s;
}
.expand:hover img {
  transform: scale(1.1);
}
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