body {
  font-family: Arial, sans-serif;
  background: #f0f0f0;
}
.login-box, .painel-box {
  width: 100%;
  max-width: 400px;
  margin: 80px auto;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
}
input, button {
  display: block;
  width: 100%;
  margin: 10px 0;
  padding: 10px;
}
button {
  background: #0055aa;
  color: white;
  border: none;
  cursor: pointer;
}
a { color: #0055aa; }