<main>
  <h1>Empty state demo</h1>

  <button>Click me to remove item</button>
  <ul>
    <li>Item 1</li>
    <li>Item 2</li>
    <li>Item 3</li>
  </ul>
  <div>
    Empty state shown!
  </div>
</main>

<div class="tutorials">
  <a href="https://s.juejin.cn/ds/idkVFyE1/" target="_blank">
    <svg t="1696988571607" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="4422" width="200" height="200"><path d="M924.8 576.64v-115.2c12.8-13.44 13.44-26.88 12.8-34.56-3.2-30.08-36.48-42.24-47.36-46.72-79.36-30.08-226.56-89.6-307.84-122.88-49.28-24.32-65.28-19.84-113.28-0.64-12.8 5.12-224.64 83.84-306.56 117.76-44.8 18.56-51.2 46.08-51.2 61.44 0 25.6 17.92 48.64 50.56 62.08L259.84 537.6v257.28l8.32 8.32c3.84 3.84 91.52 92.16 252.16 92.16 150.4 0 236.16-88.96 240-92.8l7.68-8.32V540.16l36.48-15.36-1.28 52.48-29.44 49.28 88.96 84.48 98.56-85.76-36.48-48.64zM710.4 771.2c-22.4 18.56-88.96 67.2-190.08 67.2-111.36 0-179.84-48.64-202.88-67.2V561.28l144.64 58.88h0.64c46.08 17.28 81.28 16 125.44-3.2l122.24-51.84v206.08z m154.24-138.24l-17.92-16.64 13.44-22.4 2.56-102.4c4.48-14.08-0.64-25.6-8.32-32-7.68-7.04-21.76-11.52-36.48-2.56L565.12 563.84c-30.08 13.44-49.92 14.08-81.92 2.56l-298.88-121.6c-7.68-3.2-12.16-6.4-14.08-8.96 1.92-1.92 6.4-5.12 14.72-8.96 81.92-33.92 302.72-116.48 305.28-117.12h0.64c38.4-15.36 38.4-15.36 67.2-0.64l1.92 0.64c80.64 32.64 226.56 92.16 307.2 122.88v163.2l16 21.12-18.56 16z" p-id="4423"></path></svg>
  </a>
  
</div>

html {
  font-size: 150%;
  line-height: 1.4;
}

body {
  display: grid; 
  justify-content: center;
  padding: 1em;
}

p {
  max-width: 30em;
}

button {
  background-color: #1ce; 
  border: 4px solid black; 
  padding: 0.5em 0.75em; 
}

ul + div {
  display: none;
}

ul:empty + div {
  display: block;
  background: hsl(240, 50%, 80%); 
  padding: 0.5em 0.75em; 
}


.tutorials {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    z-index: 9999;
    width: 64px;
    aspect-ratio: 1;
    border-radius: 50%;
    background: #3f517e;
    padding: .5rem;
    display: grid;
    place-content: center;
    transition: all .28s linear;
    
    &:hover {
      background:#4161b2;
    }
    
    & svg {
      display: block;
      width: 100%;
      height: 100%;
      filter: invert(1);
    }
  }

const button = document.querySelector('button')
const ul = document.querySelector('ul')

button.addEventListener('click', event => {
  const li = ul.children[0]
  if (li) ul.removeChild(li)

  if (ul.children.length === 0) ul.innerHTML = ''
})