/* Make the container relative */
.swap-on-hover {
  position: relative;	
	margin:  0 auto;
	max-width: 400px;
    height:400px;
}

/* Select the image and make it absolute to the container */
.swap-on-hover img {
 position: absolute;
  top:0;
  left:0;
	overflow: hidden;
	/* Sets the width and height for the images*/
	/*width: 400px;
	height: 400px;*/
}

/* 
	We set z-index to be higher than the back image, so it's alwyas on the front.

We give it an opacity leaner to .25s, that way when we hover we will get a nice fading effect. 
*/
.swap-on-hover .swap-on-hover__front-image {
  z-index: 9999;
  transition: opacity .5s linear;
  cursor: pointer;
}

/* When we hover the figure element, the block with .swap-on-hover, we want to use > so the front-image is going to have opacity of 0, which means it will be hidden, to the back image will show */
.swap-on-hover:hover > .swap-on-hover__front-image{
  opacity: 0;
}