body {
  margin: 0;
  padding: 0;
}

ul {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  margin: 0;
  padding: 0;
}

ul li {
  list-style: none;
  transition: .5s;
}

ul li a {
  position: relative;
  display: block;
  text-align: center;
  margin: 0 25px;
  color: #262626;
  font-size: 40px;
  text-decoration: none;
  text-transform: uppercase;
}

ul:hover li {
  opacity: .2;
  filter: blur(2px);
}

ul li:hover {
  opacity: 1;
  filter: blur(0);
}