body {
  margin: 4rem 0 0;
  font-size: 1.25rem;
  font-family: system-ui, sans-serif;
  text-align: center;
}

section {
  padding-block: 3rem;
}

.container {
  width: min(100% - 4rem, 50rem);
  margin-inline: auto;
}

.surface-primary {
  background: #3f637d;
  color: white;
}

.surface-secondary {
  background: #4c4171;
  color: white;
}

.surface-accent {
  background: #efca5d;
  color: black;
}

.btn {
  display: inline-block;
  padding: 1em 2em;
  cursor: pointer;
  border: 0;
  text-decoration: none;
  text-transform: uppercase;
}
.surface-primary .btn,
.surface-secondary .btn {
  background: white;
  color: black;
}
.surface-accent .btn {
  color: white;
  background: black;
}
.btn:hover,
.btn:focus {
  background: inherit;
  color: inherit;
  outline: currentColor 2px solid;
}

.text-subdued {
  font-size: 1rem;
}
.surface-primary .text-subdued {
  opacity: 0.8;
}
.surface-secondary .text-subdued {
  opacity: 0.7;
}
.surface-accent .text-subdued {
  opacity: 0.6;
}