Pure JS slider menu

HTML
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<svg onclick="openMenu()" class="menu
    -icon" xmlns="http://www.w3.org/2000
    /svg" height="24px" viewBox="0 0 24
    24" width="24px" fill="#000000"><path
    d="M0 0h24v24H0V0z" fill="none"/><path
    d="M3 18h13v-2H3v2zm0-5h10v-2H3v2zm0
    -7v2h13V6H3zm18 9.59L17.42 12 21 8.41
    19.59 7l-5 5 5 5L21 15.59z"/></svg>
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CSS
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.side-menu{
display:block;
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JAVASCRIPT
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function openMenu() {
var element = document.getElementById
       ("side-menu");
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