1. 打字效果
    代码实现：

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    <div class="wrapper">
        <div class="typing-demo">
          有趣且实用的 CSS 小技巧
        </div>
    </div>
    .wrapper {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .typing-demo {
      width: 22ch;
      animation: typing 2s steps(22), blink .5s step-end infinite alternate;
      white-space: nowrap;
      overflow: hidden;
      border-right: 3px solid;
      font-family: monospace;
      font-size: 2em;
    }

    @keyframes typing {
      from {
        width: 0
      }
    }
        
    @keyframes blink {
      50% {
        border-color: transparent
      }
    }

    实现效果：

  2. 设置阴影
    当使用透明图像时，可以使用 drop-shadow() 函数在图像上创建阴影，而不是使用 box shadow 属性在元素的整个框后面创建矩形阴影：

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    <div class="wrapper">
      <div class="mr-2">
        <div class="mb-1 text-center">
          box-shadow
        </div>
        
        <img class="box-shadow" src="https://markodenic.com/man_working.png" alt="Image with box-shadow">
      </div>
        
      <div>
        <div class="mb-1 text-center">
          drop-shadow
        </div>
        
        <img class="drop-shadow" src="https://markodenic.com/man_working.png" alt="Image with drop-shadow">
      </div>
    </div>
    .wrapper {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .mr-2 {
      margin-right: 2em;
    }

    .mb-1 {
      margin-bottom: 1em;
    }

    .text-center {
      text-align: center;
    }

    .box-shadow {
      box-shadow: 2px 4px 8px #585858;
    }

    .drop-shadow {
      filter: drop-shadow(2px 4px 8px #585858);
    }

    对比效果：

  3. 平滑滚动
    无需 JavaScript 即可实现平滑滚动，只需一行 CSS：scroll-behavior: smooth；

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    <nav>
      Scroll to: 
      <a href="#sectionA" class="link bg-red">A</a>
      
      <a href="#sectionB" class="link bg-blue">B</a>
      
      <a href="#sectionC" class="link bg-green">C</a>
    </nav>

    <div class="wrapper">
      <div id="sectionA" class="section bg-red">A</div>
      
      <div id="sectionB" class="section bg-blue">B</div>
      
      <div id="sectionC" class="section bg-green">C</div>
    </div>
    html {
      scroll-behavior: smooth;
    }

    nav {
      position: fixed;
      left: calc(50vw - 115px);
      top: 0;
      width: 200px;
      text-align: center;
      padding: 15px;
      background: #fff;
      box-shadow: 0 2px 5px 1px rgba(0, 0, 0, 0.2);
    }

    nav .link {
      padding: 5px;
      color: white;
    }

    .section {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 5em;
      text-shadow:
        0px 2px 0px #b2a98f,
        0px 4px 3px rgba(0,0,0,0.15),
        0px 8px 1px rgba(0,0,0,0.1);
    }

    .bg-red {
      background: #de5448;
    }

    .bg-blue {
      background: #4267b2;
    }

    .bg-green {
      background: #4CAF50;
    }

    实现效果：

  4. 自定义光标
    我们可以使用自定义图像，甚至表情符号来作为光标。

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    <div class="wrapper">
      <div class="tile">
        Default
      </div>
      
      <div class="tile tile-image-cursor">
        Image
      </div>
      
      <div class="tile tile-emoji-cursor">
        Emoji
      </div>
    </div>
    复制代码
    .wrapper {
      display: flex;
      height: 100vh;
      align-items: center;
      justify-content: center;
      background: #4776e6;
      background: linear-gradient(to right, #4776e6, #8e54e9);
      padding: 0 10px;
    }

    .tile {
        width: 200px;
        height: 200px;display: flex;
        align-items: center;
        justify-content: center;
        background-color: #de5448;
        margin-right: 10px;color: #fff;
        font-size: 1.4em;
        text-align: center;
      }

    .tile-image-cursor {
      background-color: #1da1f2;
      cursor: url(https://picsum.photos/20/20), auto;
    }

    .tile-emoji-cursor {
      background-color: #4267b2;
      cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'  width='40' height='48' viewport='0 0 100 100' style='fill:black;font-size:24px;'><text y='50%'>🚀</text></svg>"), auto;
    }

    实现效果：

  5. 截断文本
    一行文本溢出隐藏：

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    <div>
        白日依山尽，黄河入海流。欲穷千里目，更上一层楼。
    </div>
    div {
      width: 200px;
      background-color: #fff;
      padding: 15px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    实现效果：

还可以使用“-webkit-line-clamp”属性将文本截断为特定的行数。文本将在截断的地方会显示省略号：

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div {
  width: 200px;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

实现效果：

  1. 自定义选中样式
    CSS 伪元素::selection，可以用来自定义用户选中文档的高亮样式。

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    <div class="wrapper">
      <div>
        <p>
         默认高亮
        </p>
        <p class="custom-highlighting">
          自定义高亮
        </p>
      </div>
    </div>
    .wrapper {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    p {
      font-size: 2rem;
      font-family: sans-serif;
    }

    .custom-highlighting::selection {
      background-color: #8e44ad;
      color: #fff;
    }

    实现效果：

  2. CSS 模态框
    我们可以使用 CSS 中的 :target 伪元素来创建一个模态框。

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    <div class="wrapper">
        <a href="#demo-modal">Open Modal</a>
    </div>

    <div id="demo-modal" class="modal">
        <div class="modal__content">
            <h1>CSS Modal</h1>
            <p>hello world</p>
            <a href="#" class="modal__close">&times;</a>
        </div>
    </div>
    .wrapper {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(to right, #834d9b, #d04ed6);
    }

    .wrapper a {
      display: inline-block;
      text-decoration: none;
      padding: 15px;
      background-color: #fff;
      border-radius: 3px;
      text-transform: uppercase;
      color: #585858;
      font-family: 'Roboto', sans-serif;
    }

    .modal {
      visibility: hidden;
      opacity: 0;
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(77, 77, 77, .7);
      transition: all .4s;
    }

    .modal:target {
      visibility: visible;
      opacity: 1;
    }

    .modal__content {
      border-radius: 4px;
      position: relative;
      width: 500px;
      max-width: 90%;
      background: #fff;
      padding: 1em 2em;
    }

    .modal__close {
      position: absolute;
      top: 10px;
      right: 10px;
      color: #585858;
      text-decoration: none;
    }

    实现效果：

  3. 空元素样式
    可以使用 :empty 选择器来设置完全没有子元素或文本的元素的样式：

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    <div class="wrapper">
      <div class="box"></div>
      <div class="box">白日依山尽，黄河入海流。欲穷千里目，更上一层楼。</div>
    </div>
    .wrapper {
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .box {
      display: inline-block;
      background: #999;
      border: 1px solid #585858;
      height: 200px;
      width: 200px;
      margin-right: 15px;
    }

    .box:empty {
      background: #fff;
    }

    实现效果：

  4. 创建自定义滚动条

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    <div class="wrapper">
        <div>
          <div class="tile mr-1">
            <div class="tile-content">
              默认滚动条
            </div>
          </div>
          
          <div class="tile tile-custom-scrollbar">
            <div class="tile-content">
              自定义滚动条
            </div>
          </div>
        </div>
    </div>
    .wrapper {
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .mr-1 {
      margin-right: 1em;
    }

    .tile {
      overflow: auto;
      display: inline-block;
      background-color: #ccc;
      height: 200px;
      width: 180px;
    }

    .tile-custom-scrollbar::-webkit-scrollbar {
      width: 12px;
      background-color: #eff1f5;
    }

    .tile-custom-scrollbar::-webkit-scrollbar-track{
      border-radius: 3px;
      background-color: transparent;
    }

    .tile-custom-scrollbar::-webkit-scrollbar-thumb{
      border-radius:5px;
      background-color:#515769;
      border:2px solid #eff1f5
    }

    .tile-content {
      padding: 20px;
      height: 500px;
    }

    实现效果：

  5. 动态工具提示
    可以使用 CSS 函数 attr() 来创建动态的纯 CSS 工具提示 。

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    <h1>
      HTML/CSS tooltip
    </h1>
    <p>
      Hover <span class="tooltip" data-tooltip="Tooltip Content">Here</span> to see the tooltip.
    </p>
    <p>
      You can also hover <span class="tooltip" data-tooltip="This is another Tooltip Content">here</span> to see another example.
    </p>
    .tooltip {
      position: relative;
      border-bottom: 1px dotted black;
    }

    .tooltip:before {
      content: attr(data-tooltip); 
      position: absolute;
      width: 100px;
      background-color: #062B45;
      color: #fff;
      text-align: center;
      padding: 10px;
      line-height: 1.2;
      border-radius: 6px;
      z-index: 1;
      opacity: 0;
      transition: opacity .6s;
      bottom: 125%;
      left: 50%;
      margin-left: -60px;
      font-size: 0.75em;
      visibility: hidden;
    }

    .tooltip:after {
      content: "";
      position: absolute;
      bottom: 75%;
      left: 50%;
      margin-left: -5px;
      border-width: 5px;
      border-style: solid;
      opacity: 0;
      transition: opacity .6s;
      border-color: #062B45 transparent transparent transparent;
      visibility: hidden;
    }

    .tooltip:hover:before, 
    .tooltip:hover:after {
      opacity: 1;
      visibility: visible;
    }

    实现效果：

  1. 圆形渐变边框

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    <div class="box gradient-border">
      炫酷渐变边框
    </div>
    复制代码
    .gradient-border {
      border: solid 5px transparent;
      border-radius: 10px;
      background-image: linear-gradient(white, white), 
        linear-gradient(315deg,#833ab4,#fd1d1d 50%,#fcb045);
      background-origin: border-box;
      background-clip: content-box, border-box;
    }

    .box {
      width: 350px;
      height: 100px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 100px auto;
    }

    实现效果：

  2. 灰度图片
    可以使用 grayscale() 过滤器功能将输入图像转换为灰度。