HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :disabled Login Form</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
    }

    input, button {
      display: block;
      width: 100%;
      max-width: 16rem;
      margin-bottom: 0.65rem;
      padding: 0.5rem 0.75rem;
      border-radius: 0.4rem;
      font-size: 0.9375rem;
    }

    :disabled {
      background-color: #f1f5f9;
      border: 2px solid #94a3b8;
      color: #94a3b8;
      cursor: not-allowed;
    }

    :enabled {
      background-color: #ecfdf5;
      border: 2px solid #22c55e;
    }

    button:enabled {
      background-color: #2563eb;
      color: #fff;
      border: none;
      cursor: pointer;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <h1>Login</h1>
  <form>
    <input type="text" placeholder="Username" disabled value="johndoe">
    <input type="password" placeholder="Password">
    <button type="submit">Login</button>
  </form>
  <p><small>Username is locked; password and button are active.</small></p>
</body>
</html>

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CSS :disabled Selector - Login Form