.encaixe-container {
  background: #fff;
  padding: 20px;
  border: 1px solid #ddd;
  max-width: 900px;
  margin: auto;
}
canvas {
  border: 1px solid #aaa;
  margin-top: 10px;
  display: block;
}
input[type="number"], input[type="file"] {
  margin: 5px;
}
button {
  margin: 5px;
  padding: 6px 12px;
  background: #0073aa;
  color: white;
  border: none;
  cursor: pointer;
}
button:hover {
  background: #005a8c;
}