<div class="search">
    <svg version="1.1" viewBox="0 0 142.358 24.582">
    <path id="search-path" fill="none" d="M131.597,14.529c-1.487,1.487-3.542,2.407-5.811,2.407
        c-4.539,0-8.218-3.679-8.218-8.218s3.679-8.218,8.218-8.218c4.539,0,8.218,3.679,8.218,8.218
        C134.004,10.987,133.084,13.042,131.597,14.529c0,0,9.554,9.554,9.554,9.554H0"/>
    </svg>
    <label for="search" class="search-label"></label>
    <input type="search" id="search" autocomplete="off" class="input-search"/>
</div>
$brand: #b3c33a;
$speed: 0.5s;

body {
    color: $brand;
    background-color: #333;
}

.search {
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -300px;
    margin-top: -54px;
    width: 600px;
}

svg {
    position: absolute;
    transform: translateX(-246px);
    width: 600px;
    height: auto;
    stroke-width: 8px;
    stroke: $brand;
    stroke-width: 1px;
    stroke-dashoffset: 0;
    stroke-dasharray: 64.6 206.305;
    transition: all 0.5s ease-in-out;
    stroke-linejoin: round;
    stroke-linecap: round;
}

.input-search {
    position: absolute;
    width: calc(100% - 148px);
    height: 64px;
    top: 0;
    right: 20px;
    bottom: 0;
    left: 0;
    border: none;
    background-color: transparent;
    outline: none;
    padding: 20px;
    font-size: 50px;
    color: $brand;
}

.search-label {
    position: absolute;
    display: block;
    width: 108px;
    height: 108px;
    top: 0;
    left: 50%;
    margin-left: -54px;
    z-index: 100;
    transition: $speed ease-in-out;
}

.isActive {
    .search-label {
        transform: translateX(246px);
    }
    svg {
        stroke-dashoffset: -65;
        stroke-dasharray: 141.305 66;
        transform: translateX(0);
    }
    &.full svg {
        stroke-dashoffset: -65;
        stroke-dasharray: 141.305 66;
        transform: translateX(0);
    }
}

.full {
    .search-label {
        transform: translateX(246px);
    }
    svg {
        stroke-dashoffset: 0;
        stroke-dasharray: 64.6 206.305;
        transform: translateX(0);
    }
}
/*
	Inspired by Dribble "Search..."
    By: Anish Chandran
    Link: http://drbl.in/nRxe
*/

var searchField = $('.search');
var searchInput = $("input[type='search']");

var checkSearch = function(){
    var contents = searchInput.val();
    if(contents.length !== 0){
       searchField.addClass('full');
    } else {
       searchField.removeClass('full');
    }
};

$("input[type='search']").focus(function(){
    searchField.addClass('isActive');
  }).blur(function(){
  	searchField.removeClass('isActive');
    checkSearch();
});

External CSS

  1. https://codepen.io/WithAnEs/pen/7534eb3fb62294822de9eace9a699d85

External JavaScript

  1. //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js
  2. https://s3-us-west-2.amazonaws.com/s.cdpn.io/15979/footer-inject.js