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CSS elements seem to overlay when zooming in

I am trying to create a HTML site with CSS styling and run into the following issues:
Depending on monitors size, my HTML element's positioning changes. So if It's a bigger screen, then lets say everything fits correctly. But if you open it in a smaller screen, not everything is displayed!
If I zoom in the browsers view, the elements begin to overlay each other - yet I want to stay where they are (even if that means they wont be displayed on screen due to a high zoom IN).
(I cannot post images yet, so I'm adding a link to the picture to explain abit more):
I am also posting a fiddle where you can see my CSS for the MENU and the HTML part that is connected with it:
I have to write some code, but my code is too long and wouldn't look nice.
My Fiddle
It would be really nice of you, if you can help me out here. If it's a problem more complicated to explain on how to fix it, I'd kindly ask, if you can change my fiddle to a working version (if it's not too much to ask).
I have checked already similar Questions, but there were no efficient answers that helped me to solve my problem.

So, the reason that you are getting this behavior comes down to the fact that you have set your two buttons to each be fixed with the position set to %. This means the position of each is calculated as a percent relative to the 'viewport' (the browser window). If the window is only 500px wide, then your 40% left position button sits at 200px and the 50% left position button sits at 250px, thereby causing them to overlap.
Generally, I would not use fixed positioning here, but it's really not possible to provide a better alternative without seeing more of your code. (Perhaps you'd like to get feedback in general by posting all of your code on CR).
You can solve the problem by wrapping both elements in a div and give that div your fixed position values for the first element and allow the second button to be positioned relative to the first.
Here's an example of that approach and your updated fiddle:
Change your HTML:
<div class="btns">
<a href='index.html' class='button_lay'>NONE</a>
<a href='dft.html' class='button_dft'>NONE2</a>
</div>
Add a rule for the .btns class to your css and remove the fixed positioning from each of the buttons:
.btns {
position: fixed;
top: 80%;
left: 40%;
min-width: 300px;
}

Scrollable subcontent that doesn't change the height of the entire site

So I've been lately working on a project of mine that I'd really like to finish, not only Photoshop wise but also HTML/CSS wise and I've encountered a problem.
This is the website & some help graphics - I would like to make the content inside the white rectangle scrollable, but everything outside the rectangle should stay exactly as it is. I'm going to either use Skrollr or Parallax Scrolling, but I first need to figure out how to make it so the entire website has a fixed height and never stretches, while the subcontent div can be scrolled down and up.

Overflow: auto; does this for you, in a heartbeat.

Wordpress template div not expanding

I have a wordpress theme that i'm building but i've hit a snag with some code and can't seem to get my div to expand correctly. I've tried clearing the floats at different positions, i've tried overflow: hidden, but nothing seems to work.
What i'm trying to do is have the content slide in from either side based on what header you click. The content is based on a wordpress post for each link. So the client can easilly edit it to any size.
Because of this it isn't viable to use pixels in the sizing of it. And i know that absolute positioning means that pixels are very nearly the only option.
I've messed with everything i can think of in firebug and just cannot get it to expand.
You'll find the site here: http://tinyurl.com/okd5wnf
However i couldn't get this to work either. Maybe that'll give you a clue as to what might be wrong.
I know it's a long winded post, and i apologise. If i have time later, i should be able to make a jsfiddle. However time is short at the moment.
Any help would be appreciated. Thank you very much.

Your problems stems from setting the <div class="box"></div>'s position property to absolute. Give the parent element(<div id="body-wrapper"></div>) overflow-x:hidden; to hide children that are not being displayed, and then use negative margins to position child elements within the viewport (the parent element). This is basically how most sliders work.

Remove position absolute from box class. please also mention what desired layout you need for content. we will suggest you classes for that.

Romove position:absolute from div.box
I guess that's all.

Lush Slider full width and restricted height

I believe I have tried about everything and am failing miserably. I have been working with the lush responsive slider and have been having some major issues.
To start off I took the exact code from the demo and placed it in my header, but it had a strange padding on the bottom and right side so I removed it and thought it was working fine except for the height. It's so large that it takes over more than half the page.
When I resized the window and reloaded the page though the background of the slider sat in the top left corner much smaller than it needed to be. So the responsiveness only works if you reload at 100% screen? That doesn't make any scenes.
Also, the height is bothering me. I cannot get it to resize at all and when I did put static heights on the ul and li of 10em it did resize, but then the responsiveness went out the window.
I tried to post this in a js fiddle, but the plugin was so much code that it crashed it without running anything. If it would help I can post a dev site with this on it. As I said I used the exact html and css from the demo files I only took away a bit of padding to make it full width.
Any help would be much appreciated.

Ok, I have managed to work out a solution for the width issue. The problem seems to relate to the initial baseWidth, which defaults to 1140 pixels. Playing around with the
data-base-width="600" and data-base-height="600"
attributes in the first lush slider div tag may see you make some progress, but it looks like only fixed values are accepted, no percentages. I opted for this solution which seems to work, write the first div tag using document.write method and programmaticaly set the width the the clientWidth, as such :
<script>
document.write('<div id="lushDiv" class="lush-slider autoload shadow-a" data-slider-pause-on-hover="true" data-base-width="' + document.body.clientWidth + '" data-base-height="600" style="background: rgb(229, 229, 229)">');
</script>

My suggestion is not to use Javascript or JQuery. Some simple CSS and HTML will do.
Here is the fiddle: http://jsfiddle.net/jacobdubail/bKaxg/7/
You obviously don't need all of the CSS. Just change it to accompany your layout.
Change your width to percentages, like so:
min-width: 100%;
I would suggest changing the height to ems.

Autoresize Element (div) to Fit Horizontal Content

I tried googling, but didn't come up with much. I'm building a horizontal carousel which displays images in a LI, floated. The issue I want to solve is, everytime I add thumbnails to the carousel (I'm lazy loading), I need to recalculate the width of the carousel (so that all the floated thumbnails line up nicely side by side).
For one, I rather not have to do these kinds of calculations in JS, and for two, I found that it's hard to find a cross browser way to ensure that the width will be properly calculated (I end up having to add or remove pixels from the total width depending on the browser).
So my question is, is there any way without JS, to be able to add content to a div, and have the width adjust as needed, the same way a div's height would?
And if not, have you found a more efficient way to handle this scenario than recalculating the width every time?
I'm not new to web dev, and for as long as I've been in this field, to my knowledge this has never been possible. But with the advent of new technologies cropping up, I thought maybe there was an obscure way of achieving this now.
Thanks in advance!
[EDIT] (for clarification, but simplified): If my carousel is 500px wide with overflow hidden. There's a slideable section containing thumbnails, each is 100px wide, floated, they fit 5 across in the carousel. When a user clicks Next, it lazy loads the next set of 5 thumbnails, and appends it to the slider area after the first set of 5. But since this div was 500px wide to accommodate 5 thumbnails, adding another 5, I need to recalculate the width to get the new thumbnails to show up side by side. Ideally I'd like to find a way to have the div autoresize its width to fit horizontal content, the same way it naturally does for vertical content.

I've found that using a containing carousel div with white-space: nowrap and overflow: hidden has worked. I then have display: inline-block for each item in the div.

Using this class for each individual item:
.eachItem {
display: inline-block;
}
Will work (I've done something similar to that).
The problem is that in IE7 it won't work! and you'll have to use JavaScript anyway :(
EDIT: I meant inline-block... and as you may know, IE7 doesn't "like" it.