body {
  font-family: Arial;
  background: #f4f4f4;
  padding: 20px;
}

.box {
  background: white;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 8px;
}

input, button {
  width: 100%;
  padding: 10px;
  margin: 5px 0;
}

button {
  background: #007bff;
  color: white;
  border: none;
  cursor: pointer;
}

pre {
  background: black;
  color: #0f0;
  padding: 10px;
}