html, body {
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center; 
}

canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.save-button,
.refresh-button {
  position: center;
  background-color: white;
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}
@media (max-width: 500px) {
  .save-button {
    width: 120px;
    font-size: 14px;
    padding: 6px 10px;
  }
}