body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #333;
}
h1, h2, h3 {
  font-weight: bold;
  color: #2d2d2d;
}
button {
  cursor: pointer;
}
main {
  padding: 1rem;
}