popup.html

<!DOCTYPE html>
<html>

<head>
    <title>Craiglist Ext
    </title>
</head>

<body style="text-align: center;">
    <script type="text/javascript" src="jquery-2.2.3.min.js"></script>
    <script type="text/javascript" src="popup.js"></script>
    HIDING:
    <br>
    <select id="hiding" name="hiding" multiple>
        <option value="intern">intern</option>
        <option value="sales">sales</option>
    </select>
    <button id="btnDel">Delete</button>
    </form>
    <br>
    <br>
    <label>
        Enter Words To Hide
    </label>
    <input type="text" id="newHide" required="required">
    <button id="btnAdd">Add</button>
    <br>
    <br>
    <div style="background-color: indigo;">
        <button id="btn" style="margin: 5px;">Update</button>
    </div>
</body>

</html>