body { font-family: Arial, sans-serif; margin: 2rem; }
h1 { margin-bottom: 1rem; }
.btn-row { margin-bottom: 1rem; }
button { margin-right: 0.75rem; padding: 0.6rem 1rem; cursor: pointer; }
pre { margin-top: 1rem; background: #f6f8fa; padding: 1rem; border-radius: 8px; overflow: auto; }