<div class="card hidden">
  <h3 class="card-title">Card Title <span data-title="规则说明，规则说明，规则说明">规则</span></h3>
  <div class="card-body">
    <img class="cover" src="https://picsum.photos/600/300?random=1">
  </div>
</div>

<div class="card-wrapper">
  <div class="card visible">
    <h3 class="card-title">Card Title <span data-title="规则说明，规则说明，规则说明">规则</span></h3>
    <div class="card-body">
      <img class="clip" src="https://picsum.photos/600/300?random=2">
    </div>
  </div>
</div>

@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  font-family: "Exo", Arial, sans-serif;
  background-color: #557;
  color: #fff;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  gap: 1rem;
  padding: 3vw;
  place-content: center;
  overflow-x: hidden;
}

.card {
  border: 1px solid #eee;
  box-shadow: 0 0 1px rgba(0, 0, 0, 0.45);
  width: 100%;
  border-radius: 4px;
  overflow: hidden;
  padding: 5px;
}
.card.hidden {
  position: relative;
}
.card img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center;
}

.card-wrapper {
  position: relative;
  width: 100%;
}

.card-title {
  border-bottom: 1px dotted;
  padding: 10px 2vw;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
}
.card-title span {
  margin-left: auto;
  display: inline-flex;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 12px;
  color: #fff;
  background: #000;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  position: absolute;
  right: 0.5vw;
}
.card-title span::before,
.card-title span::after {
  content: "";
  position: absolute;
  opacity: 0;
  transition: opacity 0.28s ease;
}
.card-title span::before {
  content: attr(data-title);
  white-space: nowrap;
  padding: 5px;
  background: #f36;
  border-radius: 4px;
  left: 50%;
  transform: translate(-50%, 0);
  bottom: calc(100% + 8px);
}
.card-title span::after {
  width: 8px;
  height: 8px;
  background: #f36;
  left: 50%;
  bottom: calc(100% + 4px);
  transform: translate(-50%, 0) rotate(45deg);
}
.card-title span:hover::before,
.card-title span:hover::after {
  opacity: 1;
  transition: opacity 0.28s ease;
}