:root {
  --pageBlack: #262626;
  --pageYellow: #ffd83e;
  --pagePurple: #552b55;
  --pageRed: #E1332d;
  --pageGreen: #2ce771;
  --pageGrey: #212121;

}
body {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  font-family: sans-serif;
  background-color: var(--pageGrey);
}
button {  
  background-color:transparent;
  border: none;
  position: relative;
  width: 400px;
  height: 120px;
  text-transform: uppercase;
  line-height: 120px;
  text-align: center;
  color:white;
  font-size: 45px;
  letter-spacing: 15px;
  overflow: hidden;
}
button:before {
  content: '';
  position: absolute;
  top: 0px;
  left: -100%;
  width: 100%;
  height: 4px;
  background-color: white;
  transition: all .5s;
}
button:hover:before {
  left:0;
}
button:after {
  content: '';
  position: absolute;

span:before {
  content: '';
  position: absolute;
  top: -100%;
  right: 0;
  width: 4px;
  height: 100%;
  background-color: white;
  transition: all .5s;
}
button:hover span:before {
  top:0;
}
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 4px;
  background-color: white;
  transition: all .5s;
}
button:hover:after {
  right: 0;
}

span:before {
  content: '';
  position: absolute;
  top: -100%;
  right: 0;
  width: 4px;
  height: 100%;
  background-color: white;
  transition: all .5s;
}
button:hover span:before {
  top:0;
}


span:after {
  content: '';
  position: absolute;
  bottom: -100%;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: white;
  transition: all .5s;
}
button:hover span:after {
  bottom:0;
}