body {
  font-family: Arial, sans-serif;
  max-width: 700px;
  margin: 40px auto;
  padding: 20px;
  line-height: 1.5;
}

.box {
  border: 1px solid #ccc;
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
}

button {
  padding: 10px 14px;
  margin-right: 10px;
  cursor: pointer;
}

pre {
  background: #f5f5f5;
  padding: 12px;
  border-radius: 8px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}