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HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Andev Web</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <div class="container">
    <div class="box" style="--clr: #0f0;"></div>
    <div class="box" style="--clr: #ff0;"></div>
    <div class="box" style="--clr: #f00;"></div>
    <div class="box" style="--clr: #f0f;"></div>
    <div class="box" style="--clr: #0ff;"></div>
    <div class="box" style="--clr: #0f0;"></div>
    <div class="box" style="--clr: #ff0;"></div>
    <div class="box" style="--clr: #f00;"></div>
    <div class="box" style="--clr: #f0f;"></div>
    <div class="box" style="--clr: #0ff;"></div>
    <div class="box" style="--clr: #0f0;"></div>
    <div class="box" style="--clr: #ff0;"></div>
  </div>

<div class="login">
    <h2>Login</h2>
    <div class="inputBox">
      <input type="text" required>
      <span>Username</span>
    </div>
    <div class="inputBox">
      <input type="password" required>
      <span>Password</span>
    </div>
    <div class="inputBox">
      <input type="submit" value="Sign in">
    </div>
    <div class="group">
    <a href="#">Forgot Password</a>
    <a href="#">Sign up</a>
    </div>
  </div>

CSS

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200&display=swap');
*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #222;
  font-family: 'Poppins', sans-serif;
}
.container{
  display: grid;
  grid-template-columns: repeat(3,150px);
  grid-gap: 4px;
}
/*Andev Web*/
.container .box{
  position: relative;
  width: 150px;
  height: 150px;
  background: rgba(45, 45, 45, 1);
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}
.container .box::before{
  content: '';
  position: absolute;
  top: var(--y);
  left: var(--x);
  transform: translate(-50%, -50%);
  background: radial-gradient(var(--clr), transparent, transparent);
  width: 300px;
  height: 300px;
  transition: 0.5s, top 0.1s,left 0.1s;
}
.container .box::after{
  content: '';
  position: absolute;
  inset: 2px;
  background: rgba(45, 45, 45, 0.9);
}
.login{
  position: absolute;
  width: 450px;
  height: 600px;
  padding: 60px 40px;
  text-align: center;
  pointer-events: none;
}
.login h2{
  color: #fff;
  font-size: 2em;
  margin-bottom: 60px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  pointer-events: all;
}
.login .inputBox{
  position: relative;
  width: 100%;
  margin-top: 30px;
}
.login .inputBox input{
  width: 100%;
  padding: 20px 25px;
  outline: none;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: rgba(255, 255, 255, 0.25);
  border: 1px solid #000;
  backdrop-filter: blur(10px);
  color: #fff;
  font-size: 1em;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  pointer-events: all;
}
.login .inputBox span{
  position: absolute;
  left: 0;
  padding: 20px 25px;
  font-size: 1em;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 4px;
  transition: 0.25s;
  pointer-events: none;
}
.login .inputBox input:focus ~ span,
.login .inputBox input:valid ~ span{
  transform: translate(15px, -10px);
  font-size: 0.75em;
  background: #fff;
  color: #222;
  padding: 2px 5px;
  border: 1px solid #000;
}
.login .inputBox input[type="submit"]{
  cursor: pointer;
  font-size: 1.1em;
  font-weight: 500;
  transition: 0.25s;
}
.login .inputBox input[type="submit"]:hover{
  background: #0f0;
  color: #222;
  border: 1px solid transparent;
}
.group{
  position: relative;
  width: 100%;
  margin-top: 50px;
  display: flex;
  justify-content: space-between;
}
.group a{
  color: #222;
  background: #fff;
  padding: 2px 5px;
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: 0.05em;
  border-radius: 4px;
  pointer-events: all;
}
.group a:nth-child(2){
  background: #f0f;
  color: #fff;
  font-weight: 500;
  box-shadow: 0 0 15px #f0f, 0 0 30px #f0f, 0 0 60px #f0f;
}