:root {
  --pageBlack: #262626;
  --pageYellow: #fadf72;
  --pagePurple: #552b55;
  --pageRed: #E1332d;
  --pageGreen: #2ce771;
  --grey: #879c9b;
  --lightGreen: #12ac86;
  --pageGrey: #212121;
  --lightBlue: #e6f5ff;
}
body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: sans-serif;
  /* overflow: hidden; */
  background-color: var(--pageYellow);
}
ul {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  /* border: solid thin black; */
}
ul li {
  list-style: none;
}
ul li a {
  text-decoration: none;
  color: var(--pageBlack);
  font-size: 22px;
  display: block;
  padding: 10px 15px;
  position: relative;
}
ul li a:before {
  content: '';
  position: absolute;
  top:0;
  left:0;
  width: 100%;
  height: 2px;
  background-color: var(--pageGrey);
  transform: scaleX(0);
  transition: all .4s;
  transform-origin: left;
}

ul li a:hover:before, ul li a:hover:after {  
  transform: scaleX(1);
}
ul li a:after {
  content: '';
  position: absolute;
  bottom:0;
  left:0;
  width: 100%;
  height: 2px;
  background-color: var(--pageGrey);
  transform: scaleX(0);
  transition: all .4s;
  transform-origin: right;
}