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function oly_shortcode($atts, $content = null) { return '<span class="oly">' . esc_html($content) . '</span>'; } add_shortcode('oly', 'oly_shortcode'); function oly_custom_styles() { echo ' .oly { font-weight: bold; color: blue; background-color: yellow; padding: 2px 5px; border-radius: 5px; } '; } add_action('wp_head', 'oly_custom_styles');