Preview:
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Registration Form</title>
  <style>
    body {
      background-color: #b0ca9e;
      font-size: 16px;
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 0;
    }

    form {
      max-width: 400px;
      margin: 20px auto;
      padding: 20px;
      background-color: #fff;
      border-radius: 8px;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    }

    label {
      display: block;
      margin-bottom: 8px;
    }

    input {
      width: 100%;
      padding: 8px;
      margin-bottom: 16px;
      box-sizing: border-box;
    }

    input[type="submit"] {
      background-color: #4caf50;
      color: #fff;
      cursor: pointer;
    }
  </style>
  <script>
    function validateForm() {
      var name = document.forms["registrationForm"]["name"].value;
      var username = document.forms["registrationForm"]["username"].value;
      var password = document.forms["registrationForm"]["password"].value;
      var confirmPassword = document.forms["registrationForm"]["confirmPassword"].value;

      if (name === "" || username === "" || password === "" || confirmPassword === "") {
        alert("All fields must be filled out");
        return false;
      }

      if (username.length < 6) {
        alert("Username should be at least 6 characters");
        return false;
      }

      if (password !== confirmPassword) {
        alert("Passwords do not match");
        return false;
      }

      return true;
    }
  </script>
</head>
<body>
  <form name="registrationForm" onsubmit="return validateForm()">
    <label for="name">Name:</label>
    <input type="text" id="name" name="name" required>

    <label for="username">Username:</label>
    <input type="text" id="username" name="username" required>

    <label for="password">Password:</label>
    <input type="password" id="password" name="password" required>

    <label for="confirmPassword">Confirm Password:</label>
    <input type="password" id="confirmPassword" name="confirmPassword" required>

    <input type="submit" value="Register">
  </form>
</body>
</html>
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