CSS

hr tag customize using css

hr {
  border-top: 2px solid black;
}

custom hr in css

<hr class="style-two">

/* Inset */

hr.style-two {
border: 0;
height: 0;
border-top: 1px solid rgba(0, 0, 0, 0.1);
border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}