Untitled

<style>
.container {
    display: inline-block;
    cursor: pointer;
}

.bar1, .bar2, .bar3 {
    width: 35px;
    height: 5px;
    background-color: #333;
    margin: 6px 0;
    transition: 0.4s;
}

.change .bar1 {
    transform: rotate(-45deg) translate(-8px, 7px);
}

.change .bar2 {opacity: 0;}

.change .bar3 {
    transform: rotate(45deg) translate(-8px, -8px);
}
</style>
</head>
<body>

<p>Click on the Menu Icon to transform it to "X":</p>
<div class="container" onclick="myFunction(this)">
  <div class="bar1"></div>
  <div class="bar2"></div>
  <div class="bar3"></div>
</div>

<script>
function myFunction(x) {
    x.classList.toggle("change");
}
</script>