body {
  font-family: Arial, sans-serif;
  max-width: 700px;
  margin: 20px auto;
  padding: 10px;
  background-color: #f9f9f9;
}

h1 {
  text-align: center;
}

h2 {
  margin-top: 30px;
  border-bottom: 1px solid #ccc;
  padding-bottom: 5px;
}

#dateOutput,
#numberConversionOutput,
#mathOutput {
  background-color: #fff;
  border: 1px solid #ddd;
  border-radius: 5px;
  padding: 15px;
  line-height: 1.8;
}