body {
  font-family: Arial, sans-serif;
  background-color: #727272;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 400px;
  margin: 0 auto;
  background-color: #fff;
  border-radius: 5px;
  padding: 20px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
  color: #333;
}

h4 {
  text-align: center;
  color: #555;
  margin-bottom: 30px;
}

label {
  display: block;
  margin-bottom: 5px;
  color: #555;
}

input[type="number"] {
  width: 95%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 3px;
  margin-bottom: 10px;
}

.button-71 {
  text-align: center;
  margin-top: 20px;
}

button {
  padding: 10px 20px;
  background-color: #4caf50;
  color: #fff;
  border: none;
  border-radius: 3px;
  cursor: pointer;
}

#result {
  margin-top: 20px;
  padding: 10px;
  background-color: #f0f0f0;
  border-radius: 3px;
  text-align: center;
  font-weight: bold;
}