<button class="button">
    <span class="bar"></span>
    <span class="bar"></span>
    <span class="bar"></span>
</button>
html {
    padding: 20px;
}

.button {
    padding: 10px 8px;
    background: black;
    border: none;
}
.button > .bar {
    display: block;
    width: 20px;
    height: 2px;
    background: white;
    border-radius: 1px;
}
.button > .bar + .bar {
    margin-top: 4px;
}
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