<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://images.unsplash.com/photo-1545569341-9eb8b30979d9?ixlib=rb-1.2.1&amp;ixid=eyJhcHBfaWQiOjEyMDd9&amp;auto=format&amp;fit=crop&amp;w=2100&amp;q=80">
  </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://images.unsplash.com/photo-1545569341-9eb8b30979d9?ixlib=rb-1.2.1&amp;ixid=eyJhcHBfaWQiOjEyMDd9&amp;auto=format&amp;fit=crop&amp;w=2100&amp;q=80">
    </div>
  </div>
</div>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  height: 100vh;
  padding: 2vw;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2vw;
  place-items: center;
}

.card {
  border: 1px solid #eee;
  box-shadow: 0 0 1px rgba(0,0,0,.45);
  width: 100%;
  min-height: 20vw;
  border-radius: 4px;
  overflow: hidden;
  padding: 5px;
  
  &.hidden {
    position: relative;
  }
  
  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;
  
  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: .5vw;
    
    &::before,
    &::after {
      content: '';
      position: absolute;
      opacity: 0;
      transition: opacity  .28s ease;
    }
    
    &::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);
    }
    
    &::after {
      width: 8px;
      height: 8px;
      background: #f36;
      left: 50%;
      bottom: calc(100% + 4px);
      transform: translate(-50%, 0) rotate(45deg);
    }
    
    &:hover::before,
    &:hover::after {
      opacity: 1;
      transition: opacity  .28s ease;
    }
  }
}
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