absolute positioning and scrollable DIV - css

Question

I have this tricky CSS problem: I have this HTML:
<div id="wrapper">
<div class="left"></div>
<div id="scroll">
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</div>
<div class="right"></div>
</div>
With this CSS:
#wrapper {
position: relative;
display: block;
overflow-x: auto;
-webkit-overflow-scrolling: touch;
height: 47px;
}
#scroll {
position: relative;
height: 100%;
width: 10000px;
}
div.left, div.right {
position: absolute;
display: block;
background-color: rgba(255, 0, 0, 0.5);
width: 24px;
height: 100%;
z-index: 100;
top: 0;
}
div.left {
left: 0;
}
div.right {
right: 0;
}
And the visual result is this:
For some reason, the div.right is moving when I scroll the #scroll. I want it to always float at the boundary of #wrapper.
This is what I get right now:
Here is the jsfiddle: http://jsfiddle.net/b5fYH/
Thank you
Edit
Just because it wasn't obvious, it must work on mobile devices.

Answer 1

You have to know the difference between position: absolute and position: fixed.
The first one means: place the element in absolute position within relative element and keep in in that place (relatively).
The second: place the element in absolute position within window (frame) and keep it there no matter what happens.
Check this fiddle: http://jsfiddle.net/b5fYH/1/

Answer 2

The problem is with how overflow-x changes the wrapper div width.
The solution I found was:
Demo: http://jsfiddle.net/5jWpG/
wrapping the whole thing with a new div with the id wrapper-container
then adding the following CSS code:
#wrapper-container {
position: relative;
}
#wrapper {
position: static; /* or remove position relative from your code */
}
div.left, div.right {
bottom: 16px;
height: auto; /* or remove height: 100% from your code */
}