<div class="css-only-accordion">

    <!-- One Tab Inside The Accordion -->
    <div>
        <input type="checkbox" name="tab-1" id="tab-1">
        <label for="tab-1">Title of Tab 1</label>

        <div class="tab-content">
            <h2>Content Title (don't use h1 tag here)</h2>
            <p>Some content.... </p>p>
        </div>

    </div>

    <!-- Other Tabs with The Same Structure -->

</div>