How to write menu button with CSS Back
<div class="menu-btn">
<div class="inline"></div>
</div>
.menu-btn {
width: 25px;
height: 3px;
padding: 3px 0;
border-top: solid 3px #000;
border-bottom: solid 3px #000;
cursor: pointer;
}
.menu-btn .inline {
width: 100%;
height: 100%;
background-color: #000;
}