/*central the whole screen*/
html, body {
  margin: 0;
  padding: 0;
  background-color: #05050a;
}

body {
  min-height: 100vh;
  box-sizing: border-box;
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

/* place in main */
main {
  width: 100%;
  display: flex;
  justify-content: center;
  flex-shrink: 0;
}

canvas {
  display: block;
  width: min(calc(100vw - 32px), calc((100vh - 88px) * 960 / 680)) !important;
  height: auto !important;
}

body > button {
  margin: 0;
  flex-shrink: 0;
}