Basic PHP question (If Or Else)

Hi! I’m trying to apply some basic styling, but I’m having a problem figuring out the proper syntax for my PHP statement.

It should more or less read

“If !is_front_page OR !is_posts_page
DO THIS
else
Do THAT
end if”

Right now it’s breaking my site:

<!-- Content -->
                <?php if ( !is_front_page() && !is_posts_page() ) : ?>
                <div id="content" style="background-color:#faf2da; padding:0 20px 20px 0;">
                <?php else : ?>
				<div id="content">
				<?php endif; ?>