This won't work for a reason, I think with by using DIV is a different story, could someone please enlighten me? Many thanks!
.bar1,
.bar2,
.bar3 {
width: 20px;
height: 20px;
background-color: black;
}
<div class="burger-menu">
<span class="bar1">1</span>
<span class="bar2">2</span>
<span class="bar3">3</span>
</div>