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
1
2
.side-menu{
display:block;
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JAVASCRIPT
1
2
function openMenu() {
var element = document
       .getElementById("side-menu");
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