I'll go through code's main parts for more explanation.
HTML
<div class="wrapper">
  <div class="inner">
    <!-- images go here -->
   </div>
</div>
CSS
- 
Wrapper - height and width should be adjusted to your need:
.wrapper {
  overflow: hidden;
  position: relative;
  height: 200px;
  width: 400px;
  margin: 0 auto;
}
 
- 
Inner wrapper - To append images to:
.inner {
  height: 200px;
  width: auto;
  position: absolute;
  left: 0;
  white-space: nowrap;
}
 
- 
Transition wrappers - Used for images transition in and out:
.holder, .in, .hidden {
  position: absolute;
}
 
- 
Hide preloaded images:
.hidden {
  display: none;
}