<nav class="radikalwp-tx-ulink"><a href="#">خانه<//a><a href="#">خدمات<//a><a href="#">تماس<//a><//nav>

.radikalwp-tx-ulink { display: flex; gap: 24px; }
.radikalwp-tx-ulink a {
  position: relative;
  font-size: 15px;
  color: #334155;
  text-decoration: none;
  padding-bottom: 5px;
}
.radikalwp-tx-ulink a::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 8px;
  height: 2.5px;
  background: #6366f1;
  border-radius: 2px;
  transition: width .3s ease, height .3s ease;
}
.radikalwp-tx-ulink a:hover { color: #6366f1; }
.radikalwp-tx-ulink a:hover::after { width: 100%; height: 3px; }