body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: #f5f5f5;
}

#app {
  width: 600px;
  background: #ffffff;
  border: 1px solid #ddd;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  padding: 20px;
  text-align: center;
}

h1 {
  font-size: 24px;
  margin-bottom: 20px;
  color: #333;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

.toolbar label {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 14px;
  gap: 5px;
}

.toolbar input[type="number"] {
  width: 80px;
  padding: 5px;
  font-size: 14px;
  text-align: center;
}

.toolbar button {
  padding: 10px 20px;
  font-size: 14px;
  background: #007bff;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.toolbar button:hover {
  background: #0056b3;
}

.canvas-container {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 10px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  width: 500px;
  height: 300px;
  overflow: hidden;
}