body {
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 20px;
  background-color: #f8f9fa;
}

h1 {
  text-align: center;
}

h3 {
  color: #333;
}

.container {
  max-width: 800px;
  margin: 0 auto;
}

.area {
  background-color: #fff;
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 15px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

label {
  display: block;
  margin: 10px 0 5px;
}

input[type="number"] {
  width: 94%;
  padding: 10px;
  margin-bottom: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
}

button {
  background-color: #28a745;
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 10px 15px;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background-color: #218838;
}

.resultados {
  background-color: #e9ecef;
  border-radius: 8px;
  padding: 15px;
  margin-top: 20px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.resultados h3 {
  margin-top: 0;
}