<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">
var forEach = function (t, o, r) { if ("[object Object]" === Object.prototype.toString.call(t)) for (var c in
t) Object.prototype.hasOwnProperty.call(t, c) && o.call(r, t[c], c, t); else for (var e = 0, l = t.length; l
> e; e++)o.call(r, t[e], e, t) };
var hamburgers = document.querySelectorAll(".hamburger");
if (hamburgers.length > 0) {
forEach(hamburgers, function (hamburger) {
hamburger.addEventListener("click", function () {
this.classList.toggle("is-active");
}, false);
});
}
</script>
    
  

    
.hamburger {
  padding: 0;
  cursor: pointer;
  transition-property: opacity, 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: 40px;
  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: 20px;
  height: 3px;
  background-color: #000;
  border-radius: 4px;
  position: absolute;
  transition-property: transform;
  transition-duration: 0.15s;
  transition-timing-function: ease;
}

.hamburger-inner::before, .hamburger-inner::after {
  content: '';
  display: block;
}

.hamburger-inner::before {
  top: -6px;
}

.hamburger-inner::after {
  bottom: -10px;
}

.hamburger--collapse .hamburger-inner {
  top: auto;
  bottom: 0;
  right: 10px;
  transition-duration: 0.13s;
  transition-delay: 0.13s;
  transition-timing-function: cubic-bezier(0.55, 0.055, 0.675, 0.19);
}

.hamburger--collapse .hamburger-inner::after {
  top: -12px;
  transition: top 0.2s 0.2s cubic-bezier(0.33333, 0.66667, 0.66667, 1), opacity 0.1s linear;
}

.hamburger--collapse .hamburger-inner::before {
  transition: top 0.12s 0.2s cubic-bezier(0.33333, 0.66667, 0.66667, 1), transform 0.13s cubic-bezier(0.55, 0.055, 0.675,
  0.19);
}

.hamburger--collapse.is-active .hamburger-inner {
  transform: translate3d(0, -10px, 0) rotate(-45deg);
  transition-delay: 0.22s;
  transition-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
}

.hamburger--collapse.is-active .hamburger-inner::after {
  top: 0;
  opacity: 0;
  transition: top 0.2s cubic-bezier(0.33333, 0, 0.66667, 0.33333), opacity 0.1s 0.22s linear;
}

.hamburger--collapse.is-active .hamburger-inner::before {
  top: 0;
  transform: rotate(-90deg);
  transition: top 0.1s 0.16s cubic-bezier(0.33333, 0, 0.66667, 0.33333), transform 0.13s 0.25s cubic-bezier(0.215, 0.61,
  0.355, 1);
}
    
  

    
<button class="hamburger hamburger--collapse" type="button">
  <span class="hamburger-box"> <span class="hamburger-inner"></span>
  </span>
</button>