How to clear localStorage on button click

I followed a tutorial on Youtube about localStorage and everything went fine. After that I tried to mess around with the concepts and wanted to add a button to remove the localStorage (id ="btnClear").

by UtmostCreator

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>How to clear localStorage on button click</title>
</head>

<body>

    <content>
        <fieldset>
            <legend>Insert Data</legend>
            <input type="text" id="inpKey" placeholder="Insert Key.." />
            <input type="text" id="inpValue" placeholder="Insert Value.." />
            <button type="button" id="btnInsert">Insert</button>
        </fieldset>
        <fieldset>
            <legend>Local Storage</legend>
            <ul id="outputList"></ul>
            <br />
            <button type="button" id="btnClear">Clear</button>
        </fieldset>
    </content>

    <script type="text/javascript">
        const printLSContent = function (el) {
            for (let i = 0; i < localStorage.length; i++) {
                let key = localStorage.key(i);
                let value = localStorage.getItem(key);
                let li = document.createElement('li');
                li.innerHTML = `K: ${key}; V: ${value}`;
                el.appendChild(li);
            }
        }
        document.addEventListener("DOMContentLoaded", function (event) {
            const inpKey = document.getElementById("inpKey");
            const inpValue = document.getElementById("inpValue");
            const btnInsert = document.getElementById("btnInsert");
            const outputList = document.getElementById("outputList");
            const btnClear = document.getElementById("btnClear");
            // element.addEventListener(event, handler[, options]); // type - event type; listener - event handler; options -
            btnInsert.addEventListener('click', function () {
                const key = inpKey.value;
                const value = inpValue.value;
                localStorage.setItem(key, value);
                location.reload();
            }, false);
            printLSContent(outputList);

            // //BUTTON CLEAR
            btnClear.addEventListener('click',...