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HTML

              
                nav
  a(href="#") Home
  a(href="#") About us
  a(href="#") Serviсes
  a(href="#") Contacts
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans+Condensed)

$colorOne = #2c3e50  
$colorTwo = #34495e
$colorLink = rgba(255, 255, 255, .8)
$colorLinkHover = rgba(255, 255, 255, 1)
  
body 
  font-family "Open Sans Condensed" sans-serif
  display flex
  justify-content center
  height 100vh
  background $colorOne

nav
  flex 1 1 1
  align-self center
  
a
  font-size .7rem
  text-decoration none
  padding 1rem
  background $colorTwo
  color $colorLink
  text-transform uppercase
  letter-spacing .2rem
  transform rotateX(0deg)
  display inline-block
  &:hover
    animation rotateLink .5s cubic-bezier(.53,.23,.61,1.25) forwards
    background darken($colorOne, 5)
    color $colorLinkHover
  &:active
    background darken($colorOne, 10)
  &:first-child
    border-radius 2rem 0 0 2rem
    padding-left 2rem
  &:last-child
    border-radius 0 2rem 2rem 0
    padding-right 2rem
  
  
@keyframes rotateLink
  from
    transform rotateX(0deg)
  to
    transform rotateX(360deg)
  
              
            
!

JS

              
                
              
            
!
999px

Console