<section class="ui_section" id="buttons">
    <h2 class="ui_section_title">Buttons</h2>

    <div class="ui_block">
        <button class="btn btn_primary">Primary</button>
        <button class="btn btn_secondary">Secondary</button>
        <button class="btn btn_accent">Accent</button>
        <button class="btn btn_danger">Danger</button>
    </div>

    <div class="ui_block">
        <button class="btn btn_primary btn_small">Small</button>
        <button class="btn btn_primary">Normal</button>
        <button class="btn btn_primary btn_large">Large</button>
    </div>

    <div class="ui_block">
        <button class="btn btn_primary" disabled>Disabled</button>
    </div>
</section>