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HTML

              
                <!-- Toggle -->
<a herf="#link-to-search" class="button button-open">
  <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32" class="icon">
    <rect class="fill-none" width="32" height="32"/>
    <path class="fill-currentcolor" d="M29.82861,24.17139,25.56519,19.908A13.0381,13.0381,0,1,0,19.908,25.56525l4.26343,4.26337a4.00026,4.00026,0,0,0,5.65723-5.65723ZM5,14a9,9,0,1,1,9,9A9.00984,9.00984,0,0,1,5,14Z"/>
  </svg>
</a>

<!-- Search form overlay -->
<div class="overlay hiding">
  <button class="button button-close">
    <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32" class="icon">
      <rect class="fill-none" width="32" height="32"/>
      <path class="fill-currentcolor" d="M18.82813,16,29.41406,5.41406a1.99979,1.99979,0,0,0-2.82812-2.82812L16,13.17188,5.41406,2.58594A1.99979,1.99979,0,0,0,2.58594,5.41406L13.17188,16,2.58594,26.58594a1.99979,1.99979,0,1,0,2.82813,2.82813L16,18.82813,26.58594,29.41406a1.99979,1.99979,0,0,0,2.82813-2.82812Z"/>
    </svg>
  </button>
  <form action="#" class="form-search">
    <label for="keywords" class="visuallyhidden">Search</label>
    <input class="input input-search" id="keywords" name="keywords" type="search" placeholder="Find something…" autocorrect="off" autocapitalize="off" required>
    <button type="submit" class="button button-search">
      <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32" class="icon">
        <rect class="fill-none" width="32" height="32"/>
        <path class="fill-currentcolor" d="M29.82861,24.17139,25.56519,19.908A13.0381,13.0381,0,1,0,19.908,25.56525l4.26343,4.26337a4.00026,4.00026,0,0,0,5.65723-5.65723ZM5,14a9,9,0,1,1,9,9A9.00984,9.00984,0,0,1,5,14Z"/>
      </svg>
    </button>
  </form>
</div>
              
            
!

CSS

              
                // Variables
$base-px: 8px;
$breakpoint: 768px;
$breakpoint-max: $breakpoint - 1px;

// Colours
$background: #F7FBFB;
$background-2: #EAF5F5;
$background-3: #BBD8D8;
$primary: #FD7F71;
$primary-2: #C3D8D7;
$white: #fff;

// Font stack
$system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

// Basics
// ----------------------
body {
  display: flex;
  justify-content: center;
  align-items: center;
  align-content: center;
  background-color: $background;
  height: 100vh;
  font-family: $system; }

// For hiding the label
// ----------------------
.visuallyhidden {
  position: absolute;
  overflow: hidden;
  clip: rect(0 0 0 0);
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0; }

// Input/button reset
// ---------------------------
.input,
.button {
  display: inline-block;
  -webkit-appearance: none;
	-moz-appearance: none;
  appearance: none;
  line-height: normal;
  border: none;
  outline: none;
	max-width: 100%;
  font-family: $system; }

// SVG Helpers
// ---------------------------
.fill-currentcolor {
  fill: currentcolor; }

.fill-none {
  fill: none; }

// Icon
// ---------------------------
.icon {
  width: 24px;
  height: 24px;
  transition: .3s ease-out;
  
  @media (min-width: $breakpoint) {
    width: 32px;
    height: 32px; } }

// Button
// ---------------------------
.button {
  cursor: pointer;
  color: $primary;
  transition: .3s ease-out;
  
  &:hover,
  &:focus { 
    transform: scale(1.125);
    
    .icon {
      transform: scale(1.25); } } }

// Button (open)
// ---------------------------
.button-open {
  // Display/alignment
  display: flex;
  justify-content: center;
  align-items: center;
  align-content: center;
  
  // Sizing
  width: 96px;
  height: 96px;
  border-radius: 48px;
  
  // Style
  background-color: $white;
  box-shadow:
    0 1px 1px rgba($background-3, .6),
    0 3px 3px rgba($background-3, .4),
    0 8px 16px rgba($background-3, .3);
  
  &:hover,
  &:focus {
    box-shadow:
      0 2px 2px rgba($background-3, .4),
      0 4px 4px rgba($background-3, .3),
      0 12px 32px rgba($background-3, .3); } }

// Button (close)
// ---------------------------
.button-close {
  position: absolute;
  top: 7.5vw;
  right: 7.5vw;
  padding: 0;
  background-color: transparent; }

.button-search {
  position: absolute;
  z-index: 2;
  top: 0;
  right: 0;
  background-color: transparent;
  cursor: pointer;
  padding: 25px $base-px*2 21px;

  // Same horizontal padding .input-search
  @media (min-width: $breakpoint) {
    padding: 30px ($base-px*6); } }

// Search
// ---------------------------
.form-search {
  position: relative;
  width: 100%;

  @media (min-width: $breakpoint) {
    max-width: 720px; } }

// Input
// ---------------------------
.input-search {
  // Sizing
  padding: 26px ($base-px*2) 25px; // 72px height
  width: 100%;
  
  // Style
  font-size: 18px;
  font-weight: 600;
  color: $primary;
  background-color: $white;
  box-shadow:
    0 1px 1px rgba($background-3, .6),
    0 3px 3px rgba($background-3, .4),
    0 8px 16px rgba($background-3, .3);

  @media (min-width: $breakpoint) {
    // Sizing
    padding: 29px ($base-px*6);
    
    // Style
    font-size: 32px;
    border-radius: 30em; } }

.input-search::placeholder {
  color: $primary-2; }

// Overlay
// ---------------------------
.overlay {
  // Display
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  align-content: flex-end;
  
  // Positioning
  position: fixed;
  z-index: 3;
  left: 0;
  width: 100%;
  height: 100%;
  
  // Style
  background-image: linear-gradient(to top, $background, $background-2);
  
  @media (min-width: $breakpoint) {
    align-items: center;
    align-content: center; } }

// Transition
// ----------------------
// Initial state
.hiding {
  max-height: 0;
  opacity: 0;
  bottom: 0;
  
  // This transition happens when the close button is clicked
  // and should be faster than the .showing state
  transition:
    max-height .3s .2s cubic-bezier(0.215, 0.61, 0.355, 1),
    opacity .6s ease-out;
  
  // When hiding inner elements should be invisible too
  .button-search,
  .input-search {
    opacity: 0; }
  
  // Offset the button
  .button-search {
    transform: translate3d(0, 33%, 0); }

  // Offset the input more 
  .input-search {
    transform: translate3d(0, 50%, 0); } }

// Showing state
.showing {
  max-height: 100vh;
  top: 0;
  
  // This happens when the open button is clicked
  // max-height transition is to appear more subtle
  transition:
    max-height .4s .2s cubic-bezier(0.215, 0.61, 0.355, 1),
    opacity .8s ease-out; }

// Transitions
.button-search {
  transition: .4s .6s ease-out; }

.input-search {
  transition: .8s .3s ease-out; }
              
            
!

JS

              
                // Keep search toggling out of the global scope
(function(window, document, undefined) {
  // Variables
  var open = document.querySelector('.button-open');
  var close = document.querySelector('.button-close');
  var overlay = document.querySelector('.overlay');
  var search = document.querySelector('.input-search');
  
  // Focus on an element
  var focusOn = function(element) {
    // Only focus on the element if it contains the relevant
    // class name that means it’s actually visible
    if (overlay.classList.contains('showing')) {
      element.focus();
    }
    // Otherwise remove the focus from the element
    else {
      element.blur();
    }
  }
  
  // Toggles a set of class names on an element
  var toggler = function() {
    // Toggle the classes which set off the transition
    overlay.classList.toggle('hiding');
    overlay.classList.toggle('showing');
    
    // Once the overlay’s transition ends focus the search field
    overlay.addEventListener('transitionend', focusOn.bind(null, search), false);
    
    // Prevent the clicks from navigating away
    return false;
  }
  
  // Add the event listener to the toggle
  open.addEventListener('click', toggler, false);
  close.addEventListener('click', toggler, false);
})(window, document);
              
            
!
999px

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