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<!doctype html>
<html lang='en'>
<head>
<meta charset='UTF-8'>
<meta name='viewport'
content='width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0'>
<meta http-equiv='X-UA-Compatible' content='ie=edge'>
<title>Document</title>
<style>
.hamburger {
padding: 15px 15px;
display: inline-block;
cursor: pointer;
transition-property: opacity, -webkit-filter;
transition-property: opacity, filter;
transition-property: opacity, filter, -webkit-filter;
transition-duration: 0.15s;
transition-timing-function: linear;
font: inherit;
color: inherit;
text-transform: none;
background-color: transparent;
border: 0;
margin: 0;
overflow: visible; }
.hamburger:hover {
opacity: 0.7; }
.hamburger-box {
width: 30px;
height: 24px;
display: inline-block;
position: relative; }
.hamburger-inner {
display: block;
top: 50%;
margin-top: -2px; }
.hamburger-inner, .hamburger-inner::before, .hamburger-inner::after {
width: 30px;
height: 4px;
background-color: #000;
border-radius: 4px;
position: absolute;
transition-property: -webkit-transform;
transition-property: transform;
transition-property: transform, -webkit-transform;
transition-duration: 0.15s;
transition-timing-function: ease; }
.hamburger-inner::before, .hamburger-inner::after {
content: '';
display: block; }
.hamburger-inner::before {
top: -10px; }
.hamburger-inner::after {
bottom: -10px; }
.hamburger--squeeze .hamburger-inner {
transition-duration: 0.1s;
transition-timing-function: cubic-bezier(0.55, 0.055, 0.675, 0.19); }
.hamburger--squeeze .hamburger-inner::before {
transition: top 0.1s 0.14s ease, opacity 0.1s ease; }
.hamburger--squeeze .hamburger-inner::after {
transition: bottom 0.1s 0.14s ease, -webkit-transform 0.1s cubic-bezier(0.55, 0.055, 0.675, 0.19);
transition: bottom 0.1s 0.14s ease, transform 0.1s cubic-bezier(0.55, 0.055, 0.675, 0.19);
transition: bottom 0.1s 0.14s ease, transform 0.1s cubic-bezier(0.55, 0.055, 0.675, 0.19), -webkit-transform 0.1s cubic-bezier(0.55, 0.055, 0.675, 0.19); }
.hamburger--squeeze.is-active .hamburger-inner {
-webkit-transform: rotate(45deg);
transform: rotate(45deg);
transition-delay: 0.14s;
transition-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1); }
.hamburger--squeeze.is-active .hamburger-inner::before {
top: 0;
opacity: 0;
transition: top 0.1s ease, opacity 0.1s 0.14s ease; }
.hamburger--squeeze.is-active .hamburger-inner::after {
bottom: 0;
-webkit-transform: rotate(-90deg);
transform: rotate(-90deg);
transition: bottom 0.1s ease, -webkit-transform 0.1s 0.14s cubic-bezier(0.215, 0.61, 0.355, 1);
transition: bottom 0.1s ease, transform 0.1s 0.14s cubic-bezier(0.215, 0.61, 0.355, 1);
transition: bottom 0.1s ease, transform 0.1s 0.14s cubic-bezier(0.215, 0.61, 0.355, 1), -webkit-transform 0.1s 0.14s cubic-bezier(0.215, 0.61, 0.355, 1); }
</style>
</head>
<body>
<div class='hamburger hamburger--squeeze'>
<div class='hamburger-box'>
<div class='hamburger-inner'></div>
</div>
</div>
</body>
<script>
document.getElementsByClassName('hamburger')[0].onclick = function () {
this.classList.contains('is-active') ? this.classList.remove('is-active') : this.classList.add('is-active');
}
</script>
</html>
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