body {
  font-family: Arial;
  text-align: center;
  background: #f4f4f4;
}

canvas {
  border: 2px solid #000;
  margin: 10px;
}

.toolbar button,
.export button {
  margin: 4px;
  padding: 8px 12px;
}

.filters {
  margin: 10px;
}

.ad-space {
  height: 60px;
  background: #ddd;
  line-height: 60px;
}