:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}
body {
  margin: 0;
  background: #f4f8ff;
  color: #17324d;
}
header,
main {
  box-sizing: border-box;
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 24px;
}
header a {
  color: #075aa8;
  font-weight: 700;
}
main {
  margin-bottom: 40px;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(22, 68, 112, .1);
}
h1,
h2,
h3 {
  color: #075aa8;
  line-height: 1.25;
}
p,
li {
  line-height: 1.65;
}