シャープなアウトラインボタン（ホバーで色が変わる）

<div class="push-button_box">
  <a href="#" class="push-button outline-clean">詳細を見る</a>
</div>

.push-button_box{
  width: fit-content;
  margin: 50px auto;
}
.push-button.outline-clean {
  display: inline-block;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  color: #333;
  border: 2px solid #333;
  border-radius: 4px;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
}
.push-button.outline-clean:hover {
  background-color: #333;
  color: white;
}