body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #0d1117;
  color: #e6edf3;
  text-align: center;
}
header img {
  max-width: -webkit-fill-available;
}
.heading { 
  text-align: center; 
}
.store-img {
  max-height: 12rem;
}
.example-img {
  max-height: 20rem;
}
h1 {
  margin: 0;
  font-size: 2.2rem;
  color: #58a6ff;
}
p.tagline {
  margin: 0.5rem 0 1rem;
  font-size: 1.2rem;
  color: #c9d1d9;
}
.cta {
  display: inline-block;
  background: #238636;
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-size: 1.1rem;
  margin-top: 1rem;
}
.cta:hover {
  background: #2ea043;
}
section {
  max-width: 700px;
  margin: 2rem auto;
  padding: 0 1rem;
  text-align: left;
}
section h2 {
  color: #58a6ff;
  margin-bottom: 0.5rem;
}
footer {
  background: #161b22;
  padding: 1rem;
  font-size: 0.9rem;
  color: #8b949e;
}
footer a {
  text-decoration: none;
}
a { color: #58a6ff; }