使用 Popover API 创建弹窗，自定义关闭按钮，HTML/Vue代码在线实时编辑、预览

            
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button {
  font-size: 100%;
  padding: 0.75rem 1.5rem;
  background: white;
  transition-duration: 0.5s;
  border: 4px solid plum;
  background: lavenderblush;
  border-radius: 1rem;
  
  &:hover,
  &:focus {
    background: plum;
    color: white;
  }
}

[popover] {
  background: black;
  color: white;
  font-weight: 400;
  padding: 1rem;
  border-radius: 1rem;
  max-width: 22ch;
  line-height: 1.4;
  top: 2rem;
  margin: 0 auto;
  gap: 1rem;
}

[popover]:popover-open {
  display: flex;
}

body {
  background: #fcf9fb;
  display: grid;
  font-size: 1.5rem;
  font-family: system-ui, sans-serif;
  place-items: center;
  height: 100dvh;
}

/* 关闭按钮 */
.close-btn {
  border: none;
  background: none;
  justify-self: end;
  font-size: 1.5rem;
  border-radius: 0.8rem;
  
  [aria-hidden] {
    filter: grayscale() brightness(10);
  }
  
  &:hover,
  &:focus {
    background: plum;
    filter: none;
  }
}

/* 你还可以给带有 popover 属性的元素设置过度动画 */

/*   打开时   */
[popover]:popover-open {
  translate: 0 0;
}

/*   关闭时   */
[popover] {
  transition: translate 0.3s ease-out, display 0.3s ease-out allow-discrete;
  translate: 0 -22rem;
}

/*   打开之前   */
@starting-style {
  [popover]:popover-open {
    translate: 0 -22rem;
  }
}