body {
  margin: 0;
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.toolbar {
  display: flex;
  align-items: center;
  background-color: #f4f4f4;
  padding: 10px;
  border-bottom: 1px solid #ddd;
  gap: 10px;
}

button, select, input {
  padding: 5px;
}

canvas {
  flex-grow: 1;
  display: block;
  cursor: crosshair;
}