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HTML

              
                ul.items
 li.item Item A
 li.item Item B
 li.item Item C
 li.item Item D
 .selection.left
 .selection.right
              
            
!

CSS

              
                // Using http://colorhunt.co/c/10278

@import url(https://fonts.googleapis.com/css?family=Droid+Serif);

body, html
  margin: 0
  padding: 0
  width: 100%
  height: 100%

body
  display: flex
  flex-direction: row
  justify-content: center

.items
  position: relative
  display: block
  align-self: center
  padding: 0
  
  font-family: 'Droid Serif', serif;
  font-size: 22px
  color: #2B4450
  overflow: hidden
  
  .item
    display: inline-block
    border-top: 3px solid #497285
    border-bottom: 3px solid #497285
    min-width: 80px
    margin: 10px
    padding: 3px
    text-align: center
    transition: all 0.2s ease
    
    &:hover
      margin: 3px
      padding: 10px
      border-color: #F78536
      color: #F78536
    
  .selection
    content: ''
    position: absolute
    top: 13px
    &.left
      left: -110px
    &.right
      left: 110%
    display: block
    height: 1em
    width: 80px
    margin: 3px
    padding: 3px 10px
    background-color: #2B4450
    opacity: 0
    z-index: -1
    transition: all 0.8s, left 0.6s 0.1s
    transition-timing-funtion: ease-in
  
  .item:hover ~ .selection
    top: 3px
    left: 0
    padding: 12px 10px
    opacity: 1
    transition-delay: 0s
    transition-timing-funtion: ease-out
    
  for num in (1..10)
    .item:nth-child({num+1}):hover ~ .selection
      left: num * 112px
    
  
              
            
!

JS

              
                # No JS this time, sorry...

###
Maybe it would be nice to add some JS that would change the selection's width based on the element's width, and the selection's left based on the position of that element. That would make it possible to have different sized items...
###
              
            
!
999px

Console