html {
  display: grid;
  place-items: center;
  min-height: 100vh;
  overflow: hidden;
}

body {
  background: black;
}

.tap {
  width: 20vw;
  height: 20vw;
  border: 10px solid white;
  border-radius: 50%;
  box-shadow: 0 0 2rem white,
    inset 0 0 1rem white;
  cursor: pointer;
  font-size:6vw;
  line-height: calc(20vw - 10px);
  text-align: center;
  font-family: monospace;
  color: white;
  text-shadow: 0 0 25px white;
  user-select: none;
  transition: 150ms;
  box-sizing: border-box;
}

.down {
  transform: scale(1.04);
}

.b {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border-width: 5px;
  border-style: solid;
  position: absolute;  
  pointer-events: none;
}
.top {
  top: -75px;
  animation: top 1s linear forwards;
}
@keyframes top {
  100% { top: 110%; opacity:0; }
}

.bottom {
  top: 100%;
  animation: bottom 1s linear forwards;
}
@keyframes bottom {
  100% { top: -75px; opacity:0;}
}

.left {
  left: -75px;
  animation: left 1s linear forwards;
}
@keyframes left {
  100% { left: 110%; opacity:0; }
}

.right {
  left: 100%;
  animation: right 1s linear forwards;
}
@keyframes right {
  100% { left: -75px; opacity:0; }
}