jQuery or CSS

on this page: inspyrus(DOT) com
as you scroll down.  A grey box opens.  Is that jQuey or is that CSS?  How do I find it in the script?  It also jumps around in Safari.  Any clues on how to stop it from jumping around in Safari as you scroll down slowly.
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Julian HansenConnect With a Mentor Commented:
It is a combination

You have the jQuery here

Look around lines 571 and 1276
RobOwner (Aidellio)Commented:
IT's a Wordpress site that utilizes a theme that's a mix of jquery and css.

You can see this by going to your dev tools in a browser e.g. chrome:

RobOwner (Aidellio)Commented:
As for stopping it jumping around, not much you can do other than turn JavaScript off for that site.
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rgranlundAuthor Commented:
It is the Grey bar that opens at the very top.  The box jumps in safari as you scroll down slowly.
the code responsible to do this use jQuery :

At the end of the file, the following call the parallaxPosition function when you scroll or resize the window:

Open in new window

of course it use alose CSS
rgranlundAuthor Commented:
ok, so do you think if I research parallaxPosition jumping in Safari I may find an answer?
here the page of the plugin : http://www.minimit.com/articles/lets-animate/parallax-backgrounds-with-centered-content

the demo page don't have the issue you mentioned... on any browser
rgranlundAuthor Commented:
It seems like there are a lot of posts about safari and paralax being jumpy.

I don't believe the link you sent me addresses my issue.
where to see that posts ?
the link I sent to you is from the creator of the plugin and I did not saw any issue with its demo page
so I believe issues come from the way its used
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