body {
  font-family: Arial, sans-serif;
  background: #f6f6f6;
  margin: 0;
}
.container {
  max-width: 800px;
  margin: 24px auto;
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
fieldset {
  border: 1px solid #ddd;
  margin-bottom: 16px;
  padding: 12px;
}
label {
  display: block;
  margin-bottom: 10px;
}
input {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  box-sizing: border-box;
}
button {
  background: #c00;
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 4px;
  cursor: pointer;
}
.resultado {
  margin-top: 16px;
  background: #f0f0f0;
  padding: 10px;
}