<div class="card">
  
  <div class="card_part card_part-one">
  </div>
  
   <!-- Photo 2 -->
  <div class="card_part card_part-two">

  </div>

  <!-- Photo 3 -->
  <div class="card_part card_part-three">
  </div>

  <!-- Photo 4 -->
  <div class="card_part card_part-four">
  </div>

</div>

*,
*::before,
*::after { box-sizing: border-box; }

html,
body {
  display: flex;
  align-items: center;
  justify-content: center;
  align-items: center;
  
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;

  background-color: #3c3c3c;
}


.card {
  position: relative;
  
  width: 700px;
  height: 400px;
  overflow: hidden;

  border-radius: 5px;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.3);
}

/*Light blue cover above the slide show*/
.card::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  z-index: 900;

  display: block;
  width: 100%;
  height: 100%;

  background-color: rgba(140, 22, 115, 0.2);
}

.card_part {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 7;

  display: flex;
  align-items: center;
  width: 100%;
  height: 100%;
  
  transform: translateX( 700px );
  background-image: url( https://github.com/Flat-Pixels/assets_hosting/blob/master/picture_slides/1.jpg?raw=true );
  
  animation: opaqTransition 28s cubic-bezier(0, 0, 0, 0.97) infinite;
}


.card_part.card_part-two {
  z-index: 6;
  background-image: url( https://github.com/Flat-Pixels/assets_hosting/blob/master/picture_slides/2.jpg?raw=true );
  animation-delay: 7s;
}

.card_part.card_part-three {
  z-index: 5;
  background-image: url( https://github.com/Flat-Pixels/assets_hosting/blob/master/picture_slides/3.jpg?raw=true );
  animation-delay: 14s;
}

.card_part.card_part-four {
  z-index: 4;
  background-image: url( https://github.com/Flat-Pixels/assets_hosting/blob/master/picture_slides/4.jpg?raw=true );
  animation-delay: 21s;
}


@keyframes opaqTransition {
  3% { transform: translateX( 0 ); }
  25% { transform: translateX( 0 ); }
  28% { transform: translateX( -700px ); }
  100% { transform: translateX( -700px ); }
}