* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
  }
  
  body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f8ff;
  }
  
  form {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    width: 350px;
  }
  
  input[type="text"],
  input[type="email"],
  input[type="password"],
  input[type="number"] {
    width: 100%;
    padding: 12px;
    margin-bottom: 16px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 1rem;
    transition: border-color 0.3s;
  }
  
  input:focus {
    outline: none;
    border-color: #007bff;
  }
  
  input[type="submit"] {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  input[type="submit"]:hover {
    background-color: #0056b3;
  }
  
  .err {
    border-color: #dc3545;
    background-color: #f8d7da;
  }
  
  .passed {
    border-color: #28a745;
    background-color: #d4edda;
  }