final-countdown/lib/templates/layouts/_layout.pug

doctype html
html(lang='en')
    head
        title Client test
        script(src="https://unpkg.com/htmx.org@1.8.0" integrity="sha384-cZuAZ+ZbwkNRnrKi05G/fjBX+azI9DNOkNYysZ0I/X5ZFgsmMiBXgDZof30F5ofc" crossorigin="anonymous")

    body
        header
            block header
        main
            block content
        footer
            block footer