"html" element viewport width not adjusted when pagesize is set to landscape in a named @page (unnamed works ok)

Hi, first of all thanks for creating an amazing utility.

I ran into the following issue though, here is my 'testcase' html in condensed form:

```

@page portrait {
size: a4 portrait;
}
@page landscape {
size: a4 landscape;
border: 5px solid red;
}
html.portrait {
page: portrait;
}
html.landscape {
page: landscape;
}
html {
height: 100%;
border: 5px solid green;
}

```

By putting a 'landscape' CSS class on the "html" element, the "@page landscape" rule is activated, which is evidenced by the produced PDF being in landscape mode, and the page having a thick red border box.
Inside this red box however is a much narrower green box around the "html" element - I would have expected this to align on all sides to the red box instead. When you change the "@page landscape" selector to just "@page", the green box does indeed have the same width as the red box.