Problems with CSS scrollbars in Safari - css

I'm having an issue with a scrollbar that doesn't scroll. Here is my web page (still under construction): http://www.personal.psu.edu/pzb4/zacs/
CSS file is at http://www.personal.psu.edu/pzb4/zacs/css/screen.css
The scrollbars work fine when tested in Chrome and Firefox. Safari seems to be the problem. When I click on the Depth of Field link, the scrollbar is inactive for some reason. I was having the same problem with the Exposure link, but once I fiddled with that and somehow got it working, the Depth of Field scrollbar stopped working! I didn't do anything to change that and it was working before. Scratching my head as to why this doesn't work right. Any help humbly appreciated.

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Strange behaviour in Chromium browsers with scrollable overflow

I have some custom drop-down menues that are acting strange.
https://bohuslansmuseum.iplace.se/kunskapsbanken/
The drop-downs looks alright, til you start scrolling down. Then you'll notice that the
background starts flickering and behaving strangely. Also, when you hover over them they start flickering.
The problem is only visible on chromium based browsers, and I've tested it on both Mac and Windows. I've tested it in safari and firefox, and there they behave correctly.
If anyone has any idea to how I should tackle this would be greatly appreciated, I'm pretty lost to what to do, I've tried the basics with playing around with display background but I'm currently clueless.
Edit:
The problem remains even with overflow:auto. Have changed the title to match.

Issues with ScrollMagic and GreenSock on Chrome

I am doing an animation with ScrollMagic and GreenSock's TimelineMax. The animation is suppose to go in a WordPress page. However the animation has some glitches when the page is open in Chrome. This problem does not occur in Safari and Firefox. I can't test for IE.
This is how the problem looks like:
And this is how it is suppose to look like:
The most bottom part with title Your web site goes up, and the two top parts move down. As I said, it works perfect on Safari and Firefox, but on Chrome you have to scroll up and down to fix the issue. However this is not acceptable for us, since the users of our page wont see the animation properly when they first scroll down.
Here is JSFiddle of the animation. Now, this will most probably work without problems in JSFiddle, but when I put this in WordPress page it looks like on the first image. Does anybody have a clue why this happens?
I found the solution :) I don't want to delete the question, because I hope somebody will find it useful.
The solution is to increase the z-index of all the elements (images, divs, everywhere where I have z-index in the css.). I increased it for 1000 on every element and it worked.

Navbar overflows scrollbars

I've been struggling with this problem for a few days now. Navigation bar on my page hides browser scrollbars. This happens in Chrome (both desktop and mobile) and Firefox - I didn't chceck other browsers yet but I suppose the result will be the same.
I tried like every single solution I found on Google and Stack Overflow but none of them fully worked. The navbar either kept covering the scrollbars or it wasn't clickable because it was under the rest of the page.
Can somebody browse my CSS and help me with this problem? Thanks a lot!
P.S.: I use no CSS framework. I downloaded the template from here and sligtly modified it.

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I am experiencing some weird floating-behavior in Google Chrome within the first responsive project I am working on.
I've uploaded an anonymized version of my responsive header here: http://files.uiux.de/140618_header/
Whenever I visit this page on a desktop with Google Chrome, having no cache of the page, the contact-information in the right-hand corner seem to have a margin-top and 'broken' floating of the icons. As soon as I reload the Page, the position is automatically fixed.
I can reproduce this behavior by resizing the Chrome window to it's narrowest setting, refreshing the page and then resize Chrome until the contact-information shows up again.
I am baffled by this behavior. Firefox and Safari work just fine. Can someone explain to me what is happening there and maybe offer a possible solution?
Here's a screenshot of both the initial rendering and the one after refreshing.

SimpleModal content isn't loading in IE8 when CSS overflow is set to "scroll" or "auto"

I'm using simplemodal on a website I'm developing. Everything was working fine across all browsers until I added "overflow: auto;" to my simplemodal CSS as such:
#simplemodal-container {height:90%; width:80%; color:#fff; overflow:
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I get the scrollbars when needed in FF, Safari, and Chrome just fine, but when I look at it in IE8 (haven't tried IE6 or IE7), most if not all of the content of the modal is missing. It appears to be spinning as though it's waiting for the server, but nothing happens.
I've looked everywhere online for an answer to this issue, but haven't been able to find anyone else who's having the same issue.
Please let me know if you need anything else from me.
Thank you in advance!
Pekka, thanks for taking a look. I was sure that it wasn't the javascript, because one of the buttons, (resume) links to a simple html doc with a table and that wasn't even showing up.
But I think I've figured it out!
In the CSS, there were also some opacity settings, which I pretty much copied over from the simplemodal website. But one of the settings was an IE workaround that was throwing errors whenever I validated the page. So about 5 minutes ago, I thought, "hm. I wonder if I get rid of those opacity settings if that might do the trick." I wasn't really using them anyway - I had set the opacity of my modal window to 100%. So I just got rid of the settings, and now it works in IE. Go figure.
On the "images" modal, my thumbnails are getting cut off in IE, so I do have one more thing to figure out, but at least it's showing up now!
HOO-RAY.

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