:root{
  --time: 0.075s;
  --w: 5;
  --h: 5;
}
*{
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body{
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  box-sizing: border-box;
  background-color: black;
  user-select: none;
  overflow: hidden;
}
body > div{
  position: absolute;
  top: calc(50vh - 20vmin);
  left: calc(50vw - 20vmin);
  width: calc(8vmin * var(--w));
  height: calc(8vmin * var(--h));
  display: grid;
  grid-template-columns: repeat(var(--w), 1fr);
  grid-template-rows: repeat(var(--h), 1fr);
}
body > div > span{
  display: block;
  width: 8vmin;
  height: 8vmin;
  border: 1px white solid;
  border-radius: 50%;
  color: white;
  font-size: 2.9vmin;
  font-weight: bold;
  text-align: center;
  line-height: 7.6vmin;
  transition: all linear var(--time);
  overflow: hidden;
}
body > div > span.active{
  background-color: white;
  color: black;
  animation: active var(--time) linear;
}
@keyframes active {
  0%{
    border: 2px white solid;
    font-size: 0;
  }
  100%{
    border: 4vmin white solid;
    font-size: 2.9vmin;
    color: black;
  }
}
body > span > div{
  position: absolute;
}
body > span > div#up, body > span > div#down{
  left: calc(50vw - 20vmin);
  height: 2vmin;
  width: 40vmin;
  display: grid;
  grid-template-columns: repeat(var(--w), 1fr);
}
body > span > div#left, body > span > div#right{
  top: calc(50vh - 20vmin);
  height: 40vmin;
  width: 2vmin;
  display: grid;
  grid-template-rows: repeat(var(--h), 1fr);
}
body > span > div#up{
  top: calc(50vh - 24vmin);
}
body > span > div#down{
  bottom: calc(50vh - 24vmin);
}
body > span > div#left{
  left: calc(50vw - 24vmin);
}
body > span > div#right{
  right: calc(50vw - 24vmin);
}
body > span > div > span{
  border: 1px rgba(255, 255, 255, 0.5) solid;
  border-radius: 1vmin;
}
body > span > div#up > span, body > span > div#down > span{
  width: 8vmin;
  height: 2vmin;
}
body > span > div#left > span, body > span > div#right > span{
  width: 2vmin;
  height: 8vmin;
}
body > span > div#up > span::before{
  content: "";
  box-sizing: border-box;
  position: absolute;
  top: calc(1vmin - 50vh);
  display: block;
  width: calc(8vmin + 0.5px);
  height: 50vh;
  transform: translateX(-1.5px);
  border-left: 1px rgba(255, 255, 255, 0.125) solid;
}
body > span > div#up > span:nth-child(5):before{
  border-right: 1px rgba(255, 255, 255, 0.125) solid;
}
body > span > div#down > span::before{
  content: "";
  box-sizing: border-box;
  position: absolute;
  top: 1vmin;
  display: block;
  width: calc(8vmin + 0.5px);
  height: 50vh;
  transform: translateX(-1.5px);
  border-left: 1px rgba(255, 255, 255, 0.125) solid;
}
body > span > div#down > span:nth-child(5):before{
  border-right: 1px rgba(255, 255, 255, 0.125) solid;
}
body > span > div#left > span::before{
  content: "";
  box-sizing: border-box;
  position: absolute;
  left: calc(1vmin - 50vw);
  display: block;
  width: 50vw;
  height: calc(8vmin + 0.5px);
  transform: translateY(-1.5px);
  border-top: 1px rgba(255, 255, 255, 0.125) solid;
}
body > span > div#left > span:nth-child(5):before{
  border-bottom: 1px rgba(255, 255, 255, 0.125) solid;
}
body > span > div#right > span::before{
  content: "";
  box-sizing: border-box;
  position: absolute;
  left: 1vmin;
  display: block;
  width: 50vw;
  height: calc(8vmin + 0.5px);
  transform: translateY(-1.5px);
  border-top: 1px rgba(255, 255, 255, 0.125) solid;
}
body > span > div#right > span:nth-child(5):before{
  border-bottom: 1px rgba(255, 255, 255, 0.125) solid;
}