Iosslider is a Touch Enabled, Responsive jQuery Horizontal Content Slider/Carousel/Image Gallery Plugin. More info and documentation here: https://iosscripts.com/iosslider/

A slide image can be added as a background image which is responsively adapted to the resolution of the screen size. For example:

<div class="slide-image" style="background-image:url(images/sliders/iosslider_fullheight/slide3.jpg);"></div>

The captions have inside a container and simply bootstrap grid so you can basically do whatever you want inside.

<div class="iosslider-caption-wrapper">

  <div class="container">
    <div class="row">
      <div class="col-sm-12">

        <div class="iosslider-caption ">
          <h3 class="capt fs-xxxxl ">SOME TITLE HERE</h3>
          <h3 class="capt fs-xxl ">AND A SUBTITLE AS WELL HERE</h3>
          <a href="#" class="capt btn btn-vs btn-custom ">GET STARTED</a>
        </div>

      </div>
    </div>
  </div>

</div>