odoo_theme/theme_nano/views/snippets_options.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <template id="snippet_options" inherit_id="website.snippet_options">
        <xpath expr="//div[@id='so_main_colorpicker']" position="attributes">
            <attribute name="data-selector" add=".s_images_captions_fw [class*='col-'], .media-content, .media-options, .profile-body, .profile-options > [class*='col-'], .carousel-box-content, .s_text_block_image_fw [class*='col-'], .news-carousel-time, .news-carousel-content, .s_color_blocks_4 [class*='col-lg-']"/>
        </xpath>
        <xpath expr="//div[@data-js='background']" position="attributes">
            <attribute name="data-selector" add=".s_images_captions_fw [class*='col-'], .media-content, .media-options, .profile-body, .profile-options > [class*='col-'], .carousel-box-content, .s_text_block_image_fw [class*='col-'], .news-carousel-time, .news-carousel-content, .s_color_blocks_4 [class*='col-lg-']"/>
        </xpath>

        <xpath expr="//div[@data-js='sizing_y']" position="attributes">
            <attribute name="data-selector" add="h1, h2, h3, h4, h5, h6"/>
        </xpath>

        <!-- Styles -->
        <xpath expr="//div[@id='so_main_colorpicker']" position="after">
            <div data-selector="h1, h2, h3, h4, h5, h6">
                <we-collapse-area>
                    <we-toggler><i class="fa fa-fw fa-paint-brush"/> Style</we-toggler>
                    <we-collapse>
                        <we-button data-toggle-class="text-muted">Muted</we-button>
                        <we-button data-toggle-class="text-uppercase">Uppercase</we-button>
                        <we-button data-toggle-class="text-underline">Underline</we-button>
                        <we-button data-toggle-class="text-boxed">Boxed</we-button>
                    </we-collapse>
                </we-collapse-area>
            </div>
        </xpath>

        <!-- Disable top content snippet options -->
        <xpath expr="//div[@data-js='topMenuTransparency']" position="replace"/>
        <xpath expr="//div[@data-js='topMenuColor']" position="replace"/>
    </template>
</odoo>