<div class="flexslider text-center">
  <ul class="slides">
    <li class="text-center">
      <div class="bg-holder overlay rounded" style="background-image:url(../assets/img/header/1.jpg);"></div> <!--/.bg-holder-->
      <div class="row align-items-center min-vh-50">
        <div class="col">
          <h2 class="ls-1 text-white">We are smart</h2>
        </div>
      </div>
    </li>
    <li class="text-center">
      <div class="bg-holder overlay rounded" style="background-image:url(../assets/img/header/2.jpg);"></div> <!--/.bg-holder-->
      <div class="row align-items-center min-vh-50">
        <div class="col">
          <h2 class="ls-1 text-white">We are awesome</h2>
        </div>
      </div>
    </li>
    <li class="text-center">
      <div class="bg-holder overlay rounded" style="background-image:url(../assets/img/header/3.jpg);"></div> <!--/.bg-holder-->
      <div class="row align-items-center min-vh-50">
        <div class="col">
          <h2 class="ls-1 text-white">Take a breath</h2>
        </div>
      </div>
    </li>
  </ul>
</div>