* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: #f6f8fc;
  color: #202b43;
  font: 16px/1.8 system-ui, -apple-system, sans-serif;
}
main {
  max-width: 820px;
  margin: 48px auto;
  padding: 40px;
  background: #fff;
  border: 1px solid #e4eaf3;
  border-radius: 18px;
}
nav,
footer {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
a {
  color: #2968dc;
}
h1 {
  font-size: 36px;
  line-height: 1.3;
}
h2 {
  margin-top: 32px;
  font-size: 22px;
}
small {
  color: #64748b;
}
.brand {
  font-weight: 800;
  font-size: 22px;
  text-decoration: none;
}
.button {
  display: inline-block;
  background: #3476f2;
  color: white;
  text-decoration: none;
  border-radius: 10px;
  padding: 10px 22px;
}
footer {
  border-top: 1px solid #e4eaf3;
  margin-top: 36px;
  padding-top: 24px;
}
@media (max-width: 640px) {
  main {
    margin: 12px;
    padding: 24px;
  }
  h1 {
    font-size: 28px;
  }
}

.brand img { display: block; }
nav { align-items: center; }