body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
}
header {
  background: #ffffff;
  text-align: center;
  padding: 2em 1em;
}
.tagline {
  font-size: 1.2em;
  color: #666;
}
main {
  padding: 1em;
}
section {
  margin-bottom: 2em;
}
.button {
  display: inline-block;
  padding: 0.75em 1.5em;
  background: #0055ff;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}
footer {
  text-align: center;
  padding: 1em;
  background: #eee;
  font-size: 0.9em;
}