* {
  font-family: 'Roboto', sans-serif;
  background-color: #282c34;
  color: #fff;
}

h1 {
  font-size: 2rem;
  margin: 0;
  padding: 0;
  width: 100%;
  text-align: center;
  height: 5vh;
}

/* vertical column with horizontal centering */
.main-panel {
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 70vh;
}

canvas {
  border-radius: 10px;
  border: 2px solid #61afef;
  margin: 0 auto;
  width: 640px;
  height: 480px;
  display: block;
}

#controls {
  text-align: center;
}