Pure CSS Expanding Slideshow

A pure CSS/CSS3 expanding slideshow that allows you to expand a slideshow item on mouse hover. Behaviors like an accordion.

How to use it:

Add block elements to the slideshow.

<div class="block image1">
  <div class="layer"></div>
  <div class="p-container">
     <p class="img-p"> Description 1 </p>
   </div>
</div>
<div class="block image2">
  <div class="layer"></div>
  <div class="p-container">
     <p class="img-p"> Description 2 </p>
   </div>
</div>
<div class="block image3">
  <div class="layer"></div>
  <div class="p-container">
     <p class="img-p"> Description 3 </p>
   </div>
</div>

The primary CSS styles for the slideshow.

.block {
  width: 10%;
  height: 300px;
  display: inline-block;
  background-color: #E83F6F;
  cursor: pointer;
  position: relative;
  -webkit-transition: width .5s ease-in-out, background-color .5s ease-in-out;
  -moz-transition: width .5s ease-in-out, background-color .5s ease-in-out;
  -ms-transition: width .5s ease-in-out, background-color .5s ease-in-out;
  -o-transition: width .5s ease-in-out, background-color .5s ease-in-out;
  transition: width .5s ease-in-out, background-color .5s ease-in-out;
  text-align: center;
}
.block:hover {
  background-color: #2274A5;
  width: 30%;
  -webkit-transition: width .5s ease-in-out, background-color .5s ease-in-out;
  -moz-transition: width .5s ease-in-out, background-color .5s ease-in-out;
  -ms-transition: width .5s ease-in-out, background-color .5s ease-in-out;
  -o-transition: width .5s ease-in-out, background-color .5s ease-in-out;
  transition: width .5s ease-in-out, background-color .5s ease-in-out;
}
.block:hover .img-p {
  opacity: 1;
  -webkit-transition: opacity .5s .51s ease-in-out;
  -moz-transition: opacity .5s .51s ease-in-out;
  -ms-transition: opacity .5s .51s ease-in-out;
  -o-transition: opacity .5s .51s ease-in-out;
  transition: opacity .5s .51s ease-in-out;
}
.block:hover .layer {
  opacity: .5;
  -webkit-transition: opacity .5s ease-in-out;
  -moz-transition: opacity .5s ease-in-out;
  -ms-transition: opacity .5s ease-in-out;
  -o-transition: opacity .5s ease-in-out;
  transition: opacity .5s ease-in-out;
}
.layer {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  background-color: #000;
  width: 100%;
  height: 100%;
  opacity: 0;
}
.img-p {
  position: absolute;
  font-size: 16px;
  opacity: 0;
  color: #FFF;
  text-align: left;
  line-height: 1.6em;
}
.p-container {
  width: 80%;
  position: relative;
  top: 35%;
  margin-left: 5%;
}

Add background images to the block elements.

.image1 {
  background-image: url(1.jpg);
  -webkit-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}
.image2 {
  background-image: url(2.jpg);
  -webkit-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}
.image3 {
  background-image: url(3.jpg);
  -webkit-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}

Make the slideshow responsive.

@media (max-width: 768px) {
.block {
  width: 100%;
  height: 200px;
  -webkit-transition: height .5s ease-in-out;
  -moz-transition: height .5s ease-in-out;
  -ms-transition: height .5s ease-in-out;
  -o-transition: height .5s ease-in-out;
  transition: height .5s ease-in-out;
}
.block:hover {
  width: 100%;
  height: 400px;
  -webkit-transition: height .5s ease-in-out;
  -moz-transition: height .5s ease-in-out;
  -ms-transition: height .5s ease-in-out;
  -o-transition: height .5s ease-in-out;
  transition: height .5s ease-in-out;
}
}
@media (min-width: 768px) {
.block { width: 15%; }
}
@media (min-width: 992px) {
.block { width: 10%; }
}