:root {
  --color: #fff;
  --background-color: #000;
}

body {
  min-height: 100vh;
  background-color: var(--background-color);
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: center;
          align-items: center;
  font-weight: 16px;
}

.wrapper {
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  padding: 0 10px;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 1px solid var(--color);
  border-top: 1px solid var(--color);
}

li {
  border-bottom: 1px solid var(--color);
  padding: 1em 0 1em 1em;
}

a {
  --width: 0;
  color: var(--color);
  font-size: 1em;
  line-height: 1em;
  font-weight: bold;
  text-decoration: none;
  display: -webkit-box;
  display: flex;
  width: var(--width);
  white-space: nowrap;
  -webkit-box-pack: justify;
          justify-content: space-between;
  -webkit-transition: all .8s;
  transition: all .8s;
}

a:hover {
  --width: 100%;
}