style.css

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
}

img {
  max-width: 100%;
  height: auto;
}

main, section {
  padding: 0.8rem;
  margin: 0 auto;
  max-width: 768px;
}