body { font-family: sans-serif; max-width: 640px; margin: 2rem auto; }
label { display: block; margin: 0.5rem 0; }
input, textarea { width: 100%; }
textarea { min-height: 6rem; }
.error { color: #b00020; }
header { display: flex; justify-content: space-between; align-items: center; }