CSS - 偽類 :hover 屬性

CSS 中的:hover 偽類用於在使用者將滑鼠游標懸停在元素上時將其作為目標。其目的是應用樣式或觸發特定行為，以增強使用者體驗或提供額外的視覺反饋。

:hover 有助於使互動式元素更加動態和引人入勝，而無需使用者除了移動滑鼠之外的任何輸入。

語法

:hover {
    /* ... */
}

CSS :hover 示例

這是一個在懸停時更改連結背景顏色的示例

<html>
<head>
<style>
    div {
        padding: 1rem;
    }
    a {
        background-color: rgb(238, 135, 9);
        font-size: 1rem;
        padding: 5px;
    }
    a:hover {
        background-color: rgb(235, 235, 169);
    }
</style>
</head>
<body>
    <div>
        <h3>Hover example - link</h3>
        <a href="#">Hover over to see the color change!!!</a>
    </div>
</body>
</html>

這是一個在懸停時更改按鈕背景顏色的示例

<html>
<head>
<style>
   div {
      padding: 1rem;
   }
   button {
      background-color: greenyellow;
      font-size: large;
   }
   button:hover {
      background-color: gold;
   }
</style>
</head>
<body>
      <h3>Hover example - button</h3>
      <button>Hover me!!!</button>
   </div>
</body>
</html>

這是一個在懸停時更改連結邊框的示例

<html>
<head>
<style>
   .link {
      color: blue;
      text-transform: uppercase;
      padding: 20px;
      border: 4px solid blue;
      border-radius: 10px;
      display: inline-block;
   }
   .link:hover {
      color: #494949;
      border-radius: 45px;
      border-color: #494949;
   }
</style>
</head>
<body>
   <h3>Hover effect on border of the link</h3>
   <div class="button"><a class="link" href="#">Check my borders on hover</a></div>
</body>
</html>

這是一個在懸停時向連結新增盒陰影的示例

<html>
<head>
<style>
   a {
      font-size: 2rem;
      color: #071402;
      margin: 0 .25rem;
      padding: 0 .25rem;
      transition: color .3s ease-in-out, box-shadow .3s ease-in-out;
   }
   a:hover {
      box-shadow: inset 100px 0 0 100px #9ce2cc;
      color: rgb(240, 32, 32);
   }
</style>
</head>
<body>
   <div>
      <a href="#">Hover over me!!</a>
   </div>
</body>
</html>

這是一個在懸停時連結背景擴充套件的示例

<html>
<head>
<style>
   a {
      text-decoration-line: underline;
      color: #18272F;
      font-size: 2rem;
      position: relative;
   }
   a::before {
      content: '';

      background-color: rgba(118, 213, 83, 0.75);
      font-size: 2rem;
      position: absolute;
      left: 0;
      bottom: 3px;
      width: 100%;
      height: 10px;
      z-index: -1;
      transition: all .5s ease-in-out;
   }
   a:hover::before {
      bottom: 0;
      height: 100%;
   }
</style>
</head>
<body>
   <div>
      <a href="#">Hover over me!!</a>
   </div>
</body>
</html>

這是一個在懸停時連結下劃線呈現彩虹顏色效果的示例

<html>
<head>
<style>
   a {
      color: black;
      text-decoration: none;
      }
   a {
      background:
      linear-gradient(
      to right,
      rgb(179, 232, 168),
      rgb(185, 162, 215)
      ),
      linear-gradient(
      to right,
      rgba(255, 0, 0, 1),
      rgba(255, 0, 180, 1),
      rgba(0, 200, 50, 1)
      );
      background-size: 100% 5px, 0 5px;
      background-position: 100% 100%, 0 100%;
      background-repeat: no-repeat;
      transition: background-size 700ms;
   }
   a:hover {
      background-size: 0 5px, 100% 5px;
   }
   body {
      display: grid;
      font-family: Verdana, Geneva, Tahoma, sans-serif;
      font-size: 2rem;
      height: 100vh;
   }
</style>
</head>
<body>
   <div>
      <a href="#">Hover over me!!</a>
   </div>
</body>
</html>

這是一個在懸停時為按鈕新增陰影效果的示例

<html>
<head>
<style>
   body {
      display: grid;
      justify-content: center;
      align-items: center;
   }
   .glow {
      padding: 10px;
      width: 250px;
      height: 50px;
      border: none;
      outline: none;
      color: #fff;
      background: #111;
      cursor: pointer;
      position: relative;
      z-index: 0;
      border-radius: 20px;
   }
   .glow:before {
      content: '';
      background: linear-gradient(60deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
      position: absolute;
      top: -4px;
      left:-4px;
      background-size: 400%;
      z-index: -1;
      filter: blur(15px);
      width: calc(100% + 6px);
      height: calc(100% + 6px);
      animation: glowing 20s linear infinite;
      opacity: 0;
      transition: opacity .3s ease-in-out;
      border-radius: 10px;
   }
   .glow:active {
      color: rgb(246, 235, 235)
   }
   .glow:active:after {
      background: transparent;
   }
   .glow:hover:before {
      opacity: 1;
   }
   .glow:after {
      z-index: -1;
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background: #111;
      left: 0;
      top: 0;
      border-radius: 10px;
   }
   @keyframes glowing {
      0% { background-position: 0 0; }
      50% { background-position: 400% 0; }
      100% { background-position: 0 0; }
   }
</style>
</head>
<body>
   <button class="glow" type="button">HOVER OVER & CLICK!</button>
</body>
</html>

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