html,
body {
  margin: 0;
  padding: 0;
  background-color: black;
}

canvas {
  display: block;
}

#regenBtn {
  position: fixed;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  filter: blur(8px);
  transition: filter 0.35s ease, transform 0.15s ease;
  z-index: 1000;
  -webkit-tap-highlight-color: transparent;
}

#regenBtn:hover {
  filter: blur(2px);
}

#regenBtn:active {
  filter: blur(12px);
  transform: translate(-50%, -50%) scale(0.88);
}

#unsupported-msg {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: rgba(255, 255, 255, 0.7);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  text-align: center;
  padding: 2em;
}

.unsupported-browser #regenBtn {
  display: none;
}