body {
  font-family: "Roboto", sans-serif;
  margin: 10px auto;
  width: 878px;
  max-width: 99%;
  border: 1px solid #eeeeee;
}

.warning {
  display: none;
  font-size: 30px;
}

@media only screen and (max-width: 600px) {
  .main-container,
  canvas {
    display: none !important;
  }
  .warning {
    display: block;
  }
}