body {
  margin: 0;
  height: 100vh;
  background: linear-gradient(to bottom, #000000, #111111);
  font-family: Arial, sans-serif;
  color: #00ff00;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

canvas {
  width: 100%;
  height: 100%;
  background: #111;
  border-radius: 20px;
  display: block;
  padding: 0; /* removido */
  box-sizing: border-box;
  box-shadow: 0 0 30px #00ff44aa;
}