.visualizador-container {
  background: #fff;
  padding: 20px;
  border: 1px solid #ddd;
  max-width: 800px;
  margin: auto;
}
input[type="file"] {
  margin: 10px 0;
}
canvas {
  border: 1px solid #aaa;
  margin-top: 10px;
}
img {
  margin-top: 10px;
  border: 1px solid #ccc;
}