.mc-fab{
  position: fixed;
  right: 12px;
  top: calc(12px + env(safe-area-inset-top));
  z-index: 999999;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(20,24,30,.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
  font-weight: 900;
  padding: 10px 14px;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,.28);
  touch-action: none;
}
.mc-fab:active{
  transform: translateY(1px);
}