body {
  margin: 40px auto;
  max-width: 650px;
  line-height: 1.6;
  font-size: 18px;
  color: #444;
  padding: 0 10px;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.header {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 1rem;
}
h1,
h2,
h3 {
  line-height: 1.2;
}