body {
  font:
    15px/1.4 system-ui,
    sans-serif;
  margin: 0 auto;
  max-width: 860px;
  padding: 1rem;
}
header {
  align-items: center;
  display: flex;
  justify-content: space-between;
}
section {
  border-top: 1px solid #ddd;
  padding: 0.5rem 0 1rem;
}
pre {
  background: #f6f6f6;
  max-height: 24rem;
  overflow: auto;
  padding: 0.5rem;
  white-space: pre-wrap;
}
input {
  min-width: 18rem;
}