#mt-back-to-top {
  position: fixed;
  right: calc(18px + env(safe-area-inset-right, 0px));
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  z-index: 44;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid #06d6e8;
  border-radius: 50%;
  background: #087f99;
  color: #fff;
  box-shadow: 0 4px 18px rgba(8, 145, 178, .28);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
#mt-back-to-top[hidden] { display: none; }
#mt-back-to-top:hover { background: #075f74; }
#mt-back-to-top:focus-visible { outline: 3px solid #06d6e8; outline-offset: 4px; }
body { padding-bottom: calc(84px + env(safe-area-inset-bottom, 0px)); }