分享两个有意思的登录界面

1.带有浮动占位符和灯光按钮的登录界面
先上效果：
在这里插入图片描述
代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        html {
            height: 100%;
        }
        body {
            margin:0;
            padding:0;
            font-family: sans-serif;
            background: linear-gradient(#141e30, #243b55);
        }

        .login-box {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 400px;
            padding: 40px;
            transform: translate(-50%, -50%);
            background: rgba(0,0,0,.5);
            box-sizing: border-box;
            box-shadow: 0 15px 25px rgba(0,0,0,.6);
            border-radius: 10px;
        }

        .login-box h2 {
            margin: 0 0 30px;
            padding: 0;
            color: #fff;
            text-align: center;
        }

        .login-box .user-box {
            position: relative;
        }

        .login-box .user-box input {
            width: 100%;
            padding: 10px 0;
            font-size: 16px;
            color: #fff;
            margin-bottom: 30px;
            border: none;
            border-bottom: 1px solid #fff;
            outline: none;
            background: transparent;
        }
        .login-box .user-box label {
            position: absolute;
            top:0;
            left: 0;
            padding: 10px 0;
            font-size: 16px;
            color: #fff;
            pointer-events: none;
            transition: .5s;
        }

        .login-box .user-box input:focus ~ label,
        .login-box .user-box input:valid ~ label {
            top: -20px;
            left: 0;
            color: #03e9f4;
            font-size: 12px;
        }

        .login-box form a {
            position: relative;
            display: inline-block;
            padding: 10px 20px;
            color: #03e9f4;
            font-size: 16px;
            text-decoration: none;
            text-transform: uppercase;
            overflow: hidden;
            transition: .5s;
            margin-top: 40px;
            letter-spacing: 4px
        }

        .login-box a:hover {
            background: #03e9f4;
            color: #fff;
            border-radius: 5px;
            box-shadow: 0 0 5px #03e9f4,
            0 0 25px #03e9f4,
            0 0 50px #03e9f4,
            0 0 100px #03e9f4;
        }

        .login-box a span {
            position: absolute;
            display: block;
        }

        .login-box a span:nth-child(1) {
            top: 0;
            left: -100%;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, transparent, #03e9f4);
            animation: btn-anim1 1s linear infinite;
        }

        @keyframes btn-anim1 {
            0% {
                left: -100%;
            }
            50%,100% {
                left: 100%;
            }
        }

        .login-box a span:nth-child(2) {
            top: -100%;
            right: 0;
            width: 2px;
            height: 100%;
            background: linear-gradient(180deg, transparent, #03e9f4);
            animation: btn-anim2 1s linear infinite;
            animation-delay: .25s
        }

        @keyframes btn-anim2 {
            0% {
                top: -100%;
            }
            50%,100% {
                top: 100%;
            }
        }

        .login-box a span:nth-child(3) {
            bottom: 0;
            right: -100%;
            width: 100%;
            height: 2px;
            background: linear-gradient(270deg, transparent, #03e9f4);
            animation: btn-anim3 1s linear infinite;
            animation-delay: .5s
        }

        @keyframes btn-anim3 {
            0% {
                right: -100%;
            }
            50%,100% {
                right: 100%;
            }
        }

        .login-box a span:nth-child(4) {
            bottom: -100%;
            left: 0;
            width: 2px;
            height: 100%;
            background: linear-gradient(360deg, transparent, #03e9f4);
            animation: btn-anim4 1s linear infinite;
            animation-delay: .75s
        }

        @keyframes btn-anim4 {
            0% {
                bottom: -100%;
            }
            50%,100% {
                bottom: 100%;
            }
        }

    </style>
</head>
<body>
<div class="login-box">
    <h2>Login</h2>
    <form>
        <div class="user-box">
            <input type="text" name="" required="">
            <label>Username</label>
        </div>
        <div class="user-box">
            <input type="password" name="" required="">
            <label>Password</label>
        </div>
        <a href="#">
            <span></span>
            <span></span>
            <span></span>
            <span></span>
            Submit
        </a>
    </form>
</div>
</body>
</html>

2.跳跃的登录字符登陆界面
先上效果：
在这里插入图片描述
代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="style.css" />
  <title>Form Input Wave</title>
  <style>
    @import url('https://fonts.googleapis.com/css?family=Muli&display=swap');

    * {
      box-sizing: border-box;
    }

    body {
      background-color: steelblue;
      color: #fff;
      font-family: 'Muli', sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
      overflow: hidden;
      margin: 0;
    }

    .container {
      background-color: rgba(0, 0, 0, 0.4);
      padding: 20px 40px;
      border-radius: 5px;
    }

    .container h1 {
      text-align: center;
      margin-bottom: 30px;
    }

    .container a {
      text-decoration: none;
      color: lightblue;
    }

    .btn {
      cursor: pointer;
      display: inline-block;
      width: 100%;
      background: lightblue;
      padding: 15px;
      font-family: inherit;
      font-size: 16px;
      border: 0;
      border-radius: 5px;
    }

    .btn:focus {
      outline: 0;
    }

    .btn:active {
      transform: scale(0.98);
    }

    .text {
      margin-top: 30px;
    }

    .form-control {
      position: relative;
      margin: 20px 0 40px;
      width: 300px;
    }

    .form-control input {
      background-color: transparent;
      border: 0;
      border-bottom: 2px #fff solid;
      display: block;
      width: 100%;
      padding: 15px 0;
      font-size: 18px;
      color: #fff;
    }

    .form-control input:focus,
    .form-control input:valid {
      outline: 0;
      border-bottom-color: lightblue;
    }

    .form-control label {
      position: absolute;
      top: 15px;
      left: 0;
      pointer-events: none;
    }

    .form-control label span {
      display: inline-block;
      font-size: 18px;
      min-width: 5px;
      transition: 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    }

    .form-control input:focus + label span,
    .form-control input:valid + label span {
      color: lightblue;
      transform: translateY(-30px);
    }
  </style>
</head>
<body>
<div class="container">
  <h1>Please Login</h1>
  <form>
    <div class="form-control">
      <input type="text" required>
      <label>Email</label>
      <!-- <label>
        <span style="transition-delay: 0ms">E</span>
          <span style="transition-delay: 50ms">m</span>
          <span style="transition-delay: 100ms">a</span>
          <span style="transition-delay: 150ms">i</span>
          <span style="transition-delay: 200ms">l</span>
    </label> -->
    </div>

    <div class="form-control">
      <input type="password" required>
      <label>Password</label>
    </div>

    <button class="btn">Login</button>

    <p class="text">Don't have an account? <a href="#">Register</a> </p>
  </form>
</div>
<script>
  const labels = document.querySelectorAll('.form-control label')

  labels.forEach(label => {
    label.innerHTML = label.innerText
            .split('')
            .map((letter, idx) => `<span style="transition-delay:${idx * 50}ms">${letter}</span>`)
            .join('')
  })
</script>
</body>
</html>