マウスホバーするとグラデーションの背景と、遅延してテキストが浮かび上がる

Result

よく見るやつです。テキストは遅延表示されます

css

.tiles {/全体*/
  font-size: 0;
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
   transform: translate(-50%, -50%);
}
.tiles .tile {/*コンテナのスタイル*/
  display: inline-block;
  margin: 10px;
  text-align: left;
  opacity: .99;
  overflow: hidden;
  position: relative;
  border-radius: 3px;
  box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.05);
}
.tiles .tile:before {/*疑似要素を追加して重ねておく*/
  content: '';
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.7) 100%);
  width: 100%;
  height: 50%;
  opacity: 0;
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 2;
  transition-property: top, opacity;
  transition-duration: 0.3s;
}
.tiles .tile img {
  display: block;
  max-width: 100%;
  backface-visibility: hidden;
}
.tiles .tile .details {/*テキスト部分*/
  font-size: 16px;
  padding: 20px;
  color: #fff;
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: 3;
}
.tiles .tile .details span {
  display: block;
  opacity: 0;
  position: relative;
  top: 100px;
  transition-property: top, opacity;
  transition-duration: 0.3s;
  transition-delay: 0s;
}
.tiles .tile .details .title {
  line-height: 1;
  font-weight: 600;
  font-size: 18px;
}
.tiles .tile .details .info {
  line-height: 1.2;
  margin-top: 5px;
  font-size: 12px;
}
.tiles .tile:focus:before,
.tiles .tile:focus span, 
.tiles .tile:hover:before,
.tiles .tile:hover span {/*ホバー時に表示*/
  opacity: 1;
}
.tiles .tile:focus:before, 
.tiles .tile:hover:before {/*表示と同時に動かす*/
  top: 50%;
}
.tiles .tile:focus span, 
.tiles .tile:hover span {
  top: 0;
}
.tiles .tile:focus .title, 
.tiles .tile:hover .title {/*テキストだけ遅延させる*/
          transition-delay: 0.15s;
}
.tiles .tile:focus .info, 
.tiles .tile:hover .info {/*さらに遅延*/
          transition-delay: 0.25s;
}

html

<div class="tiles">
    <a class="tile" href="#">
		<img src="https://picsum.photos/200/350?image=100"/>
    <div class="details">
		<span class="title">foo</span>
		<span class="info">hogehoge</span>
    </div>
    </a>
</div>

via

Simple Tile Hover Effect