:root {
  var-green: #a6c776;
}

a {
  color: var(green);
  font-variant: all-small-caps;
  transition: color 1s;
}

a:hover {
  color: color(var(green) shade(20%));
}

::placeholder {
  opacity: .4;
  transition: opacity 1s;
}

:focus::placeholder {
  opacity: .2;
}