._gate-button {
  width: 2.65em;
  height: 2.65em;
  line-height: 2.65em;
  position: fixed;
  top: 0.7rem;
  left: 0.7rem;
  z-index: 10000;
  box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.25);
  border-radius: 3px;
  background-color: white;
  text-align: center;
  font-weight: bold;
}
._gate-button:hover {
  background-color: black;
  color: white;
}
._gate-button i {
  width: 0.45em;
  height: 1em;
  display: inline-block;
  margin-left: 0.25em;
  background: currentColor;
  animation: blink-animation 1s step-end infinite;
}
@keyframes blink-animation {
  from,
  to {
    visibility: hidden;
  }
  50% {
    visibility: visible;
  }
}