: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);
}

a {
  padding: 20px 40px;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 4px;
  color: transparent;
  border: 3px solid #ff0;
  font-size: 30px;
  position: relative;
  /* overflow: hidden; */
  transition: all 0.5s;
  
}

a:before {
  content: 'button';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #363636;
  color: #ff0;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.5s;
}
a:hover:before {  
  left: 100%;
  transform: scale(0) rotateY(360deg);
  opacity: 0;

} 

a:after {
  content: 'button';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background-color: #363636;
  color: #ff0;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.5s;
  transform: scale(0) rotateY(0deg);
  opacity: 0;
}
a:hover:after {
  left: 0;
  transform: scale(1) rotateY(360deg);
  opacity: 1;
}