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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>kevakibhack - Login</title>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Poppins', sans-serif;
    }

body {
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      background: #0f222f;
      overflow: hidden;
    }

section {
      position: relative;
      width: 100%;
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
    }

section span {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }

section span:nth-child(1) {
      clip-path: polygon(0 0, 20% 0, 40% 100%, 0% 100%);
      background: #ff3c3c;
      opacity: 0.8;
      animation: animate 15s linear infinite;
    }

section span:nth-child(2) {
      clip-path: polygon(20% 0, 40% 0, 60% 100%, 0% 100%);
      background: #00ff84;
      opacity: 0.8;
      animation: animate 25s linear infinite;
      animation-delay: -5s;
    }

section span:nth-child(3) {
      clip-path: polygon(40% 0, 60% 0, 80% 100%, 20% 100%);
      background: #ffcc00;
      opacity: 0.8;
      animation: animate 20s linear infinite;
      animation-delay: -10s;
    }

section span:nth-child(4) {
      clip-path: polygon(60% 0, 80% 0, 100% 100%, 40% 100%);
      background: #3c5cff;
      opacity: 0.8;
      animation: animate 30s linear infinite;
      animation-delay: -15s;
    }

@keyframes animate {
      0% {
        transform: translateY(-100%);
      }
      100% {
        transform: translateY(100%);
      }
    }

.signin {
      position: relative;
      z-index: 10;
      width: 380px;
      padding: 40px;
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(10px);
      border-radius: 10px;
      box-shadow: 0 25px 45px rgba(0, 0, 0, 0.2);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-right: 1px solid rgba(255, 255, 255, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      overflow: hidden;
      transition: 0.5s;
    }

.signin:hover {
      transform: translateY(-10px);
      box-shadow: 0 35px 55px rgba(0, 0, 0, 0.3);
    }

.signin::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: rgba(255, 255, 255, 0.1);
      transform: skewX(-15deg);
      transition: 0.7s;
    }

.signin:hover::before {
      left: 120%;
    }

.signin .content {
      position: relative;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

.signin .content h2 {
      color: #fff;
      font-size: 2em;
      margin-bottom: 30px;
      text-transform: uppercase;
      letter-spacing: 2px;
      text-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    }

.signin .content .form {
      width: 100%;
    }

.signin .content .form .inputBox {
      position: relative;
      width: 100%;
      margin-bottom: 30px;
    }

.signin .content .form .inputBox input {
      width: 100%;
      padding: 10px 0;
      font-size: 16px;
      color: #fff;
      border: none;
      border-bottom: 1px solid #fff;
      outline: none;
      background: transparent;
      transition: 0.5s;
    }

.signin .content .form .inputBox input:focus,
    .signin .content .form .inputBox input:valid {
      border-bottom-color: #00ff84;
    }

.signin .content .form .inputBox i {
      position: absolute;
      left: 0;
      top: 10px;
      padding: 10px 0;
      font-style: normal;
      color: #fff;
      pointer-events: none;
      transition: 0.5s;
    }

.signin .content .form .inputBox input:focus ~ i,
    .signin .content .form .inputBox input:valid ~ i {
      transform: translateY(-20px);
      font-size: 12px;
      color: #00ff84;
    }

.signin .content .form .inputBox input[type="submit"] {
      background: #fff;
      color: #0f222f;
      border: none;
      padding: 12px;
      cursor: pointer;
      border-radius: 5px;
      font-weight: 600;
      letter-spacing: 1px;
      transition: 0.5s;
    }

.signin .content .form .inputBox input[type="submit"]:hover {
      background: #00ff84;
      color: #fff;
      box-shadow: 0 0 10px #00ff84, 0 0 20px #00ff84;
    }

.signin .content .form .links {
      display: flex;
      justify-content: space-between;
      margin-bottom: 20px;
    }

.signin .content .form .links a {
      color: #fff;
      text-decoration: none;
      font-size: 14px;
      transition: 0.5s;
    }

.signin .content .form .links a:hover {
      color: #00ff84;
      text-decoration: underline;
    }

/* Responsive design */
    @media (max-width: 480px) {
      .signin {
        width: 90%;
        padding: 30px 20px;
      }
      
      .signin .content h2 {
        font-size: 1.5em;
      }
    }

/* Social media icons */
    .social-icons {
      display: flex;
      justify-content: center;
      margin-top: 20px;
    }

.social-icons a {
      color: #fff;
      margin: 0 10px;
      font-size: 20px;
      transition: 0.3s;
    }

.social-icons a:hover {
      color: #00ff84;
      transform: translateY(-5px);
    }

/* Password toggle */
    .password-toggle {
      position: absolute;
      right: 0;
      top: 10px;
      cursor: pointer;
      color: #fff;
    }

/* Loading animation */
    .loader {
      display: none;
      width: 20px;
      height: 20px;
      border: 3px solid rgba(255, 255, 255, 0.3);
      border-radius: 50%;
      border-top-color: #00ff84;
      animation: spin 1s ease-in-out infinite;
      margin-left: 10px;
    }

@keyframes spin {
      to { transform: rotate(360deg); }
    }

/* Error message */
    .error-message {
      color: #ff3c3c;
      font-size: 14px;
      margin-top: -20px;
      margin-bottom: 20px;
      display: none;
    }
  </style>
</head>
<body>
  <section>
    <span></span>
    <span></span>
    <span></span>
    <span></span>

<div class="signin">
      <div class="content">
        <h2>Login</h2>
        <div class="form">
          <div class="inputBox">
            <input type="text" required id="username">
            <i>Username</i>
          </div>
          <div class="inputBox">
            <input type="password" required id="password">
            <i>Password</i>
            <span class="password-toggle" id="togglePassword">
              <i class="fas fa-eye"></i>
            </span>
          </div>
          <div class="error-message" id="errorMessage"></div>
          <div class="links">
            <a href="#">Forgot Password</a>
            <a href="#">Sign Up</a>
          </div>
          <div class="inputBox">
            <input type="submit" value="Login" id="loginBtn">
            <div class="loader" id="loader"></div>
          </div>
          <div class="social-icons">
            <a href="#"><i class="fab fa-google"></i></a>
            <a href="#"><i class="fab fa-facebook-f"></i></a>
            <a href="#"><i class="fab fa-twitter"></i></a>
            <a href="#"><i class="fab fa-linkedin-in"></i></a>
          </div>
        </div>
      </div>
    </div>
  </section>

// Form validation
      const loginForm = document.querySelector('.form');
      const username = document.querySelector('#username');
      const passwordInput = document.querySelector('#password');
      const errorMessage = document.querySelector('#errorMessage');
      const loginBtn = document.querySelector('#loginBtn');
      const loader = document.querySelector('#loader');

loginForm.addEventListener('submit', function(e) {
        e.preventDefault();
        
        // Show loading animation
        loginBtn.disabled = true;
        loader.style.display = 'inline-block';
        loginBtn.value = 'Logging in...';
        
        // Simulate API call
        setTimeout(function() {
          // Hide loading animation
          loader.style.display = 'none';
          loginBtn.disabled = false;
          loginBtn.value = 'Login';
          
          // Simple validation
          if(username.value.trim() === '' || passwordInput.value.trim() === '') {
            errorMessage.textContent = 'Please fill in all fields';
            errorMessage.style.display = 'block';
          } else if(passwordInput.value.length < 6) {
            errorMessage.textContent = 'Password must be at least 6 characters';
            errorMessage.style.display = 'block';
          } else {
            errorMessage.style.display = 'none';
            // Here you would typically send the data to your server
            alert('Login successful! Redirecting...');
            // window.location.href = 'dashboard.html';
          }
        }, 1500);
      });

// Input field animations
      const inputBoxes = document.querySelectorAll('.inputBox input');
      
      inputBoxes.forEach(input => {
        input.addEventListener('focus', function() {
          this.parentNode.querySelector('i').style.color = '#00ff84';
        });
        
        input.addEventListener('blur', function() {
          this.parentNode.querySelector('i').style.color = '#fff';
        });
      });

// Background animation
      const spans = document.querySelectorAll('section span');
      
      spans.forEach((span, index) => {
        span.style.animationDuration = `${15 + (index * 5)}s`;
        span.style.animationDelay = `${index * -5}s`;
      });
    });
  </script>
</body>
</html>

CSS