Html-php include strange questions ~ I've never met

I have a strange problem with using PHP's include to introduce files today:

This is my header_mp.php file:

Here are some of the parts I introduced:

This should be OK, but the browser preview on the problem, the layout is all messed up, I use the chrome console a look at the source files:

How less half, strange, bottom and label lost!!!
Excuse me, what's going on here?

Online and so on!! Worry!

Reply content:

I have a strange problem with using PHP's include to introduce files today:

This is my header_mp.php file:

Here are some of the parts I introduced:

This should be OK, but the browser preview on the problem, the layout is all messed up, I use the chrome console a look at the source files:

How less half, strange, bottom and label lost!!!
Excuse me, what's going on here?

Online and so on!! Worry!

Hey , the problem is solved.

