<!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>  
  </head>  
  <body>  
   <div class="container">  
    <h1>Please Login</h1>  
    <form>  
     <div class="form-control">  
      <input type="text" required>  
      <label>Email</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 src="script.js"></script>  
  </body>  
 </html>  

@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);
}

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('')
})

External CSS

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External JavaScript

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