javascript – Border colour change like a progress bar

jQuery(window).scroll(operate() {
  var scroll = jQuery(window).scrollTop();

  if (scroll >= 40 && scroll < 80) {
    jQuery(".wpb_text_column").removeClass("inexperienced");
    jQuery(".wpb_text_column").addClass("blue");
  } else if (scroll >= 80) {
    jQuery(".wpb_text_column").removeClass("blue");
    jQuery(".wpb_text_column").addClass("inexperienced");
  } else {
    jQuery(".wpb_text_column").removeClass("blue", "inexperienced");
  }
});

.wpb_text_column {
  border-left: 5px stable #2451ae!essential;
  transition: border-left-color 0.9s ease;
}

.blue {
  border-left: 5px stable blue!essential;
  transition: border-left-color 0.9s ease;
}

.inexperienced {
  border-left: 5px stable inexperienced!essential;
  transition: border-left-color 1s ease;
}

.wpb_text_column .wpb_wrapper {
  margin-left: 20px;
}

physique {
  min-height: 800px;
  transition: background-color 0.75s ease;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="wpb_text_column">
  <div class="wpb_wrapper">
    <h3>Lorem ipsum dolor sit amet</h3>
    <p> Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea
      takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores
      et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
      At vero eos et accusam et</p>

  </div>
</div>

<div class="wpb_text_column">
  <div class="wpb_wrapper">
    <h3>Lorem ipsum dolor sit amet</h3>
    <p> Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea
      takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores
      et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
      At vero eos et accusam et</p>

  </div>
</div>

<div class="wpb_text_column">
  <div class="wpb_wrapper">
    <h3>Lorem ipsum dolor sit amet</h3>
    <p> Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea
      takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores
      et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
      At vero eos et accusam et</p>

  </div>
</div>

<div class="wpb_text_column">
  <div class="wpb_wrapper">
    <h3>Lorem ipsum dolor sit amet</h3>
    <p> Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea
      takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores
      et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
      At vero eos et accusam et</p>

  </div>
</div>