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CSS Base

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              input(type="checkbox",id="menu")
nav
  a Foo
  a Bar
  a Lorem
  a Ipsum
label(for="menu").burger
  .burger-bun
  .burger-meat
  .burger-bread
            
          
!
            
              //boilerplate
*
  box-sizing:border-box
body
  margin:0
//actual code

navHeight = 3em

nav
nav a
.burger-bun
.burger-meat
.burger-bread
  transition:.3s cubic-bezier(.45,0,.4,1.38)
nav
  background:red
  padding-top: navHeight
  transform:"translateY( calc( %s - 100% ) )" % navHeight
nav:after //clearfix
  content: ""
  display: table
  clear: both
nav a,.burger
  display:block
  padding:0 1em
  line-height:navHeight
  text-align:center
nav a
  float:left
.burger
  position:absolute
  top:0
  right:0
  width:3.5em
  margin-top: "calc( ( %s - 1.75em ) / 2 )" % navHeight
  cursor:pointer
  display:none
@media(max-width:1500px)
  nav a
    float:none
    opacity:0
  .burger
    display:block
  
.burger-bun
.burger-meat
.burger-bread
  border-top:solid .25em
  margin:.25em 0
#menu
  display:none
#menu:checked~nav
  transform:translateY( "-%s" % navHeight )
  a
    opacity:1
#menu:checked~.burger
  .burger-bun
    transform: translateY(.5em) rotate(45deg)
  .burger-meat
    transform: scaleX(0.1)
  .burger-bread
    transform: translateY(-.5em) rotate(-45deg)
            
          
!
999px
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