<div class="settings">
<p>Change the container width:</p>
  <a href="#" data-width="100px" class="btn btn-default">100px</a>
  <a href="#" data-width="200px" class="btn btn-default">200px</a>
  <a href="#" data-width="300px" class="btn btn-default">300px</a>
  <a href="#" data-width="400px" class="btn btn-default">400px</a>
  <a href="#" data-width="500px" class="btn btn-default">500px</a>
  <a href="#" data-width="auto" class="btn btn-default">Full-width</a>
</div>

<div class="my-container">

  <div class="image-wrapper">
    <div class="responsive-container">
      <img src="https://placeholdit.imgix.net/~text?txtsize=240&txt=3200%C3%971800&w=3200&h=1800" alt="My responsive image" />
    </div>
  </div>
  <p>This is a paragraph below the image</p>
  
</div>

.image-wrapper {
  max-width: 3200px;
  max-height: 1800px;
  background-color: rgba(0, 0, 0, 0.05);
  .responsive-container {
    width: 100%;
    padding-bottom: 56.25%;
    position: relative;
    img {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
    }
  }
}

/* Example styles */

.my-container {
  width: 500px;
  margin: 0 auto;
}

.my-container, .settings {
  text-align: center;
}

.settings {
  margin: 15px;
}

// Example settings
$('a').click(function(e) {
  var width = $(this).attr('data-width');
  $('.my-container').css('width', width);
});