* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #0f0f14;
  color: white;
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.app {
  text-align: center;
}

h1 {
  margin-bottom: 10px;
}

.toolbar {
  margin-bottom: 10px;
}

button {
  border: none;
  padding: 6px 10px;
  margin: 2px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

canvas {
  background: white;
  border-radius: 10px;
  border: 3px solid #333;
}