.text-animation--underline-in-header {
  background-image: linear-gradient(
    to right,
    var(--color-accent-header),
    var(--color-accent-header)
  );
  background-size: 0% 1px;
  background-repeat: no-repeat;
  display: inline;
  padding-bottom: 3px;
  transition: all 10000ms linear;
}