* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  background: linear-gradient(180deg, #c6ecff, #fff1c9);
}

#playground {
  display: block;
  width: 100vw;
  height: 100dvh;
  background:
    radial-gradient(circle at 20% 20%, #ffffff99 0 16%, transparent 17%),
    radial-gradient(circle at 85% 25%, #ffffff80 0 10%, transparent 11%),
    linear-gradient(180deg, #e7fbff 0%, #fefaf0 100%);
}

#clear-mobile {
  display: none;
  position: fixed;
  right: 12px;
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 20;
  border: 0;
  border-radius: 999px;
  padding: 10px 14px;
  font: 700 14px/1.1 "Verdana", sans-serif;
  color: #1f2937;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.16);
  -webkit-tap-highlight-color: transparent;
}

#clear-mobile:active {
  transform: scale(0.98);
}

@media (hover: none) and (pointer: coarse) {
  #clear-mobile {
    display: block;
  }
}