:root{
  --nav-height:50px;
  --nav-txt-size:22px;
}

nav{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background-color: rgb(33, 33, 33);
  display: flex;
  align-items: center;
  padding: 10px;
  justify-content: center;
}


nav a{
  text-decoration: none;
  color: white;
  padding: 10px;
  margin: 0px 20px;
  font-size: var(--nav-txt-size);
}