<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <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?</p>
      <a href="#">Register</a>
    </form>
  </div>

  <script src="./script.js"></script>
</body>

</html>
@import url("https://fonts.googleapis.com/css?family=Ubuntu");

* {
  box-sizing: border-box;
}

body {
  background-color: steelblue;
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: "Ubuntu", sans-serif;
  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;
}

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

.btn:hover {
  color: #fff;
  background-color: rgba(0, 0, 0, 0.4);
}

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

.text {
  margin-top: 30px;
}

.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;
}

.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

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.