why does twenty eleven theme mix up the css measurement units?

I’m wondering why does WordPress’s default theme mix up the css measurement units?

For example:

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.one-column.singular #author-info {
margin: 2.2em -8.8% 0;
padding: 20px 8.8%;}

Wouldn’t be easier to understand and to work if all them were pixel based?

Thanks

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1 comment

  1. Its just a css thing… while the distance from the top object is
    to remain permenant the distance from a side object is relative and
    those changes (sometimes) as the screen resulotion changes..

    That prevents smaller screens from having a broken site. Anyhow thats
    the old way to go about it (in a matter of speaking) since “Responsive website design”
    is the modern way to control website fluidity…