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HTML

              
                ul
  li
    p extract.json
  li
    p __main__.py
  li.active
    p utils.py
  li
    p 5245653.asm
              
            
!

CSS

              
                $red: #ff5c5d
$blue: #29404b
$dark: #1b2f39

html, body
  height: 100%

body
  margin: 0
  font-size: 0
  background: $blue
  overflow: hidden
  
ul
  height: 28px
  width: 100%
  padding: 0
  list-style: none
  background: $red
  overflow: hidden

li
  position: relative
  display: inline-block
  height: 26px
  width: 160px
  margin-top: 2px
  margin-right: -23px
  color: $blue + #666
  cursor: pointer
    
  p
    position: absolute
    bottom: 2px
    left: .6em
    margin: 0
    font: 16px 'Open Sans', sans-serif
      
  &::before
    position: absolute
    z-index: -1
    top: 0
    right: 0
    bottom: -3px
    left: 0
    outline: 1px solid transparent
    border-radius: 10px 10px 0 0
    background: $dark
    box-shadow: inset 0 -3px 3px rgba(0,0,0,0.2)
    content: ''
    transform: perspective(5px) rotateX(0.93deg) translateZ(-1px)
    transform-origin: 0 0
    backface-visibility: hidden
      
  @for $i from 1 through 30
    &:nth-child(#{$i})
      z-index: 100 - $i
    
ul .active
  z-index: 1000
  &::before
    background: $blue
    box-shadow: none
    
              
            
!

JS

              
                ;(function() {
  var $active = $('.active');

  $('li').click(function() {
    $active.removeClass('active');
    $(this).addClass('active');
    $active = $(this);
  });
})();

              
            
!
999px

Console