Consistency in HTML markup

[englishextra]

In your docs here
some pages have

<main class="g--10 g-m--12 m--2 m-m--0 no-margin-vertical">
		<header class="container">

there's no .container class in your surface_styles.css
see http://mildrenben.github.io/surface/docs/alerts.html

and others

<main class="g--10 g-m--12 m--2 m-m--0 no-margin-vertical">
		<header class="container--baseline">

see here http://mildrenben.github.io/surface/docs/navigation.html

also

<main class="g--10 g-m--12 m--2 m-m--0 no-margin-vertical" role="main">
		<header class="container--wrap">

see here http://mildrenben.github.io/surface/index.html

I believe all pages should have same markup, or is it designed to be so?