html {
  background: whitesmoke;
}

/* Page layout */

main,
footer {
  width: 800px;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: 16px;
  padding-right: 16px;
}

.site-footer {
  border-top: 1px solid lightgray;
  padding-top: 12px;
  padding-bottom: 24px;
  color: gray;
  text-align: center;
}

.muted {
  color: gray;
}

.hero {
  padding-top: 72px;
  padding-bottom: 48px;
  text-align: center;
}

.hero h1 {
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}

/* Circuit figure */

.circuit {
  margin: 48px auto 0;
  padding: 24px;
  background: white;
  border: 1px solid lightgray;
  border-radius: 4px;
}

.circuit-img {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  margin: 0 auto;
}

.circuit figcaption {
  margin-top: 16px;
  color: gray;
  font-size: 0.9em;
  text-align: center;
}