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<div class="panels">
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
</div>


<div class="panels">
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
</div>


<div class="panels">
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
</div>


<div class="panels">
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
</div>


<div class="panels">
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
</div>


<div class="panels">
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
  <a href="javascript:void(0)" class="panel">
    <div class="panel__content"></div>
  </a>
</div>
            
          
!
            
              @images: 
  'https://unsplash.it/1000/1000/?image=760',
  'https://unsplash.it/1000/1000/?image=883',
  'https://unsplash.it/1000/1000/?image=786',
  'https://unsplash.it/1000/1000/?image=342',
  'https://unsplash.it/1000/1000/?image=550',
  'https://unsplash.it/1000/1000/?image=821',
  'https://unsplash.it/1000/1000/?image=777';



.panels {
  overflow: hidden;
  display: flex; 
  position: relative;
  z-index: 1;
}

.panel { 
  flex: 1;
  cursor: pointer;
  background-position: center center;
  background-size: cover;
}

.panel__content {
  width: 100%;
  height: 102%;
  overflow: hidden;
  cursor: pointer;
  background: inherit;
}

.panel:before,
.panel__content:before {
  content: ' ';
  display: block;
  width: 100%;
  height: 100%;
}

.panel:before {
  background: rgba(255,255,255,0.3);
  position: relative;
  z-index: 99;
  opacity: 0;
  transition: opacity 0.3s linear;
}

/* The non-CSS Var hover state */
.panel:hover,
.panel:focus {
  &:before { opacity: 1; }

  .panel__content { 
    position: absolute; 
    top: -1%;
    left: 0;
    z-index: 98;
  }
}



/* If CSS Vars are supported... */
@supports ( (--panel-support: 0) ) {


  .panel {
    --i: 0;
    --percent: ~"calc( ((var(--i) - 1) / var(--items)) * 100 )";
  }
  
  /* 
  A simple LESS loop to set up the CSS vars.

  Output will be something like
  .panels--1 { --items: 1; }
  .panth:nth-child(1) { --i: 1; }
  .panels--2 { --items: 2; }
  .panth:nth-child(2) { --i: 2; }

  ..up to the total number provided.
  */
  .panel-maker( length(@images) );
  .panel-maker(@total, @i: @total) when (@i > 0) {
    .panel-maker(@total, ( @i - 1 ) );  
    
    .panel:nth-last-child(n+@{i}), .panel:nth-last-child(n+@{i}) ~ .panel { --items: @i; }
    .panel:nth-child( @{i} ) { --i: @i; }
  }

  .panel__content {
    position: absolute;
    top: -1%;
    left: 0%;
    z-index: auto;
    transform: translateX( ~"calc( var(--percent) * 1% )" );

    &:before {
      background: inherit;
      transform: translateX(-50%) translateX( ~"calc(100% / var(--items) * 0.5 )" );
    }
  }
  
  .panel__content,
  .panel__content:before { 
    transition: transform 0.4s cubic-bezier(.44,.0,.0,1);
  }

  /* When there's an active hover on the container. This will apply to all panels in the container, unless overridden */
  .panels:hover .panel__content { 
      z-index: auto; 
      transform: translateX(0%);
  }

  /* Panels after the hovered panel */
  .panel:hover ~ .panel .panel__content { transform: translateX( 100% ); }
  
  /* The active panel */
  .panel:hover,
  .panel:focus {
    .panel__content { transform: translateX(0%); }
    .panel__content:before { transform: translateX(0%) scale(1.2); }
  }
  
  .panel:focus {
    .panel__content,
    .panel__content:before { transition: none !important; }
  }

}



/* 
//////////////////////////////////////
STYLISTIC CHOICES
//////////////////////////////////// 
*/

.panels { 
  box-shadow: 0 0 10rem rgba(0, 0, 0, 0.6);
  height: 40vh;
  margin: 10vh auto;
  min-height: 300px;
  max-height: 700px;
}
body > .panels:first-child { margin: 15vh auto; height: 65vh; }

/* Set up the background images */
.image-loop(@total, @i: 1) when (@i <= @total) {
  .image-loop(@total, ( @i + 1 ) );
  .panel:nth-child( @{i} ) {
    background-image: ~"url(" extract(@images, @i) ~")";
  }
}
.image-loop(length(@images));

html { height: 100%; }
body { min-height: 100%; }
html, body { margin: 0; padding: 0; }
body { background: #2F3C4F; }

*, *:before, *:after {
  box-sizing: border-box;
}
            
          
!
999px
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