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HTML 

              
                .panel
  .bar
    ul
      li Settings
      li Archive
      li
        .title Inbox
        button.drawer-btn.fa-bars
        .search-container
          form
            input[placeholder="Search"]
          button.search-btn.fa-search
!

CSS 

              
                $scale: 60px
$item-height: 42px
$button-width: $item-height
$blue: #30a1ff
$faded-blue: lighten($blue, 30%)
$light-blue: lighten($blue, 40%)
$dark-blue: darken($blue,25%)

body, button, input
  font-size: 18px
  
body, button, input
  color: $light-blue
  text-shadow: 0 1px rgba($dark-blue, 0.6)
  
body, input
  font-family: 'Roboto', sans-serif
    
body
  background: $dark-blue

.panel, .bar, .search-container, input, button
  position: absolute
    
.panel
  top: 50%
  left: 50%
  overflow: hidden
  height: 4 * $scale
  width: 3 * $scale
  border: $scale/5 solid #181818
  border-radius: $scale / 10
  background: linear-gradient(135deg, $light-blue 25%, transparent 25%) -4px 0, linear-gradient(225deg, $light-blue 25%, transparent 25%) -4px 0, linear-gradient(315deg, $light-blue 25%, transparent 25%), linear-gradient(45deg, $light-blue 25%, transparent 25%)
  background-size: 8px 8px
  background-color: darken($light-blue, 2%)
  box-shadow: 0 0 24px rgba(#181818, 0.4)
  transform: translate(-50%, -50%)

.bar
  top: $item-height * -2
  overflow: hidden
  left: 0
  width: 100%
  text-align: center
  background: $blue
  box-shadow: 0 1px 2px rgba(#ababab, 0.8)
  transition: top 0.4s

ul
  margin: 0
  padding: 0
  list-style: none
    
li
  position: relative
  height: $item-height
  line-height: $item-height
  cursor: pointer
    
  &:last-child
    cursor: default
      
.search-container
  top: 0
  height: $item-height
  width: $button-width
  border-radius: 0 $item-height / 2 $item-height / 2 0
  background: $blue
  transition: width 0.4s
    
  input
    right: $button-width
    box-sizing: border-box
    height: 100%
    line-height: $item-height + 2px
    width: 3 * $scale - $button-width
    padding: 0 0 0 0.6em
    border: 0
    outline: 0
    color: $light-blue
    background: transparent
      
::placeholder
  color: $faded-blue
    
.title, .drawer-btn
  transition: opacity 0.2s 0.1s
  
button
  top: 50%
  right: 0
  height: $item-height
  width: $button-width
  margin: 0
  padding: 0
  border: 0
  outline: 0
  font-family: Fontawesome
  background: $blue
  box-shadow: 0 0 12px 8px rgba($blue, 0.9)
  cursor: pointer
  transform: translate(0, -50%)
    
.search-open
  .title, .drawer-btn
    opacity: 0
    
  .search-container
    width: 3 * $scale // can't animate to 100%
    
  .title, .drawer-btn
    transition: opacity 0.2s
    
.drawer-open
  .bar
    top: 0
!

JS 

              
                var body = document.body;
var classList = body.classList;
var form = body.querySelector('form');
var input = body.querySelector('input');
var title = body.querySelector('.title');
var search = body.querySelector('.search-btn');
var drawer = body.querySelector('.drawer-btn');
var toggle = classList.toggle.bind(classList);

function slideDrawer () {
  drawer.className = 'drawer-btn ' + (toggle('drawer-open') ? 'fa-close' : 'fa-bars');
}

function slideSearch () {
  search.className = 'search-btn ' + (toggle('search-open') ? 'fa-close' : 'fa-search');
  input.focus();
}

search.addEventListener('click', slideSearch, false);
drawer.addEventListener('click', slideDrawer, false);
form.addEventListener('submit', function (e) {
  e.preventDefault();
  var text = input.value;
  input.value = '';
  title.textContent = text ? text.charAt(0).toUpperCase() + text.slice(1) : 'Inbox';
  slideSearch();
});
!
999px

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