body {
  font-family: Arial, sans-serif;
  text-align: center;
  margin: 0;
  padding: 20px;
  background-color: #f0f0f0; 
}

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

.calculator {
  border: 1px solid: blue;
  padding: 20px;
  margin: 20px auto;
  width: 300px;
  background-color: yellow; 
}

.info {
  margin-top: 20px;
  padding: 20px;
  border: 1px solid blue;
}