body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 20px;
  background-color: #f4f4f4;
}

#drop-area {
  border: 2px dashed #007bff;
  border-radius: 5px;
  padding: 40px;
  margin: 20px auto;
  background-color: #fff;
  max-width: 400px;
}

#drop-area:hover {
  background-color: #e9ecef;
}

button {
  background-color: #28a745;
  color: white;
  padding: 10px 20px;
  margin: 10px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #218838;
}

button:active {
  background-color: #1e7e34;
}

canvas {
  display: block;
  margin: 20px auto;
  max-width: 100%;
}