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CSS overflow: auto by 'touching' bottom div

I want to make a div scrollable when its touching the bottom div.
I tried this:
margin-bottom:30px;
position: relative;
overflow: auto;
but it didn't work.
I created a fiddle tho show you my problem:
https://jsfiddle.net/wp3wvuj2/1/
For explanation: When you type in in a input field a new field is added to the div (This function is simplified). I want that before the input fields touch the element below (the START-div) it gets scrollable (overflow: auto).
Somebody have an idea?
Edit:
I noticed that nobody understands my problem.
I'll try to explain it better:
I have list where players add their names. The list has minimum 4 players maximum ∞.
The start buttonis placed at the bottom. The problem is in a iphone 5 it looks like this:
And now if i would add another player input field it would Overlap with the START-Button. Thats the reason why I want it scrollable now. I already get that work with a fixed height, but i want it responsive!
Because on a iPad for example it looks like this:
And I want prevent an overlap with the start button like this:
So it should get scrollable before it overlaps (dependent on the display size).

Updated JS fiddle, try this, i have updated CSS part in your code
https://jsfiddle.net/wp3wvuj2/2/
.main_input {
width: 209px;
top: 70px;
margin: auto;
margin-bottom:30px;
/* position: relative */
overflow: auto;
height:216px; //Give some height always to apply overflow auto
}
.main_start {
width: 100%;
margin: auto;
/* position: absolute */ //Not required
bottom: 20px;
font-family: Pamela;
font-size: 36px;
text-align: center;
}

I've only changed the styles on class main-input
.main_input {
width: 226px;
height: 234px;
top: 70px;
margin: auto;
margin-bottom:30px;
position: relative;
overflow-y: auto;
}
EDIT:
Please note for this solution to be able to work, I needed to remove the Top and Bottom positions of some elements as they were breaking the layout. Please use Margins or Paddings to get that styling you desire.
This now works to scroll once the space runs out on the page.
https://jsfiddle.net/wp3wvuj2/5/

Input field resize

I'm having trouble with re-sizing my search input bar. I've managed to make it re-size when the browser window gets smaller using width:100%;. But I can't get the starting width to be 300px without making it always 300px and then it's goes out of the parent div on resize. For some reason it's 185px;
Here's the jsfiddle of my set-up.

You are embeding your input into a span by calling $('.search2').typeahead. This span has the css-class twitter-typeahead wich is not set to width: 100%;
Add this to your CSS:
.twitter-typeahead {width: 100%;}
Then you need to change your div container css to this (width: 100%; max-width: 300px;):
.div2 {
float: left;
width: 100%;
max-width: 300px;
padding-left: 20px;
}
Leaving width: 100%; on your input is fine!
See the working code: http://jsfiddle.net/utg4mh6z/1/

Just remove all the float: left; and it works. It seems they are not required anyway. At least you don't state it anywhere and floating for 100% width elements makes no sense from my point of view.

css: shrinking images leave wide white margins on right

Update: the problem is in javascript. See comment at below
My website (Link) has 6 sliding images beneath the menu. I want to shrink the sizes of these images from 600 x 300 to 400 x 200. However, shrinking will leave wide white margins on the right side (see the developing version). In the css file, I looked at all the ul#images codes (see below) and could not figure out how to remove the white margins. Thanks for your input:
/* Image Transitions */
ul#images {
margin: 0 15px 10px 0;
padding: 0;
list-style: none;
position: relative;
}
ul#images li {
display: block;
overflow: hidden;
padding: 0;
float: left;
width: 155px; <!-- ?the portion shown initially-->
height: 300px; <!-- -->
}

The problem is not in your css, it is in the javascript, it is setting the other pictures to 66px wide on mouse over, make this width larger to fill in the white space.
Post your javascript and I will gladly fix it for you.

How to not allow the 'bounce' effect on the end of scrolling on a website?

Im trying to get this scrolling effect i have seen on the website http://www.unheap.com , if you scroll to the bottom or to the right you'll notice that you can't scroll past whatsoever. Most website including this one allow you to scroll past slightly with a lot of resistance but I'm trying to replicate the example above where you can't scroll past at all. Anyone know of any plugins or methods on how to go about creating this effect?

The actual website itself is 100% the width and height of the page and any scrolling that occurs is accomplished via an absolutely positioned container with overflow: scroll.
EDIT
The actual overflow is set on the .grid element, which is inside the absolutely positioned .container element.
EDIT #2
The author is also using jScrollPane, but you can prevent the bouncing effect simply by making your body 100% width and height and absolutely positioning a container that has overflow set to scroll.
EDIT #3
See the attached code snippet - (you may have to copy and paste it into it's own HTML file because of the way SO displays snippets). There is no bouncing.
* { margin:0; padding:0; }
html,
body { width: 100%; height: 100%; overflow:hidden;}
body>div { height: 50vh; overflow: auto; padding: 10px; background: #000; position: absolute; width: 100px; top: 100px; left: 100px;}
body>div>div { height: 1000px; background: #0f0;}
<div>
<div>scrollable content</div>
</div>

How to reveal element by scrolling?

I'm trying to make an effect similar as used on http://www.t-mobile.com/ , when the user scrolls down to the bottom of the page they reveal the "footer" more and more as the user keeps on scrolling.
I've tried to search both here and on google but haven't been able to find anything that's really useful. Most examples only shows/hide the footer once the user scrolls to the bottom.
So my question is, what's the effect called to reveal an element by scrolling? Are there any good tutorials / blog posts about this? All help I can get is much appreciated!

As I commented, you need to make your element fixed, so as explanation goes, I have two elements here, one is a normal position: relative; element, so nothing fancy about that, I assigned relative so that I can make the z-index work
Second element is positioned fixed and also, make sure you use margin-bottom which should be equal to the height of your footer, no need to assign any negative z-index whatsoever to this element.
Demo
Not much HTML ...
<div></div>
<div>Reveal Me</div>
CSS
/* These are for your main site wrapper */
div:first-child {
height: 800px; /* Even auto is fine, I
used fixed height because I don't have any content here */
background: #eee;
margin-bottom: 200px; /* Equals footer wrappers height */
z-index: 1;
position: relative;
}
/* These are for footer wrapper */
div:last-child {
background: #aaa;
height: 200px;
position: fixed;
bottom: 0;
width: 100%;
}
For Dynamic Sizes
Note that am using a fixed height for the fixed positioned element, if you have variable height in footer element, than you need to use JS or jQuery to calculate the height using
$('#wrapperElement').css('margin-bottom', $('#footer').height());
Here, the selectors of #wrapperElement and #footer are my assumed ones, you can replace those with the your own selectors.
Something about fixed element - Horizontal Centering (I think it will be helpful to some users)
When you will make your element fixed, it will get out of the document flow, so if you are assigning fixed to the wrapper of footer element and want to center some content in there, than nest another element inside that wrapper and use width and margin: auto; for that...
Demo 2
HTML
<div></div>
<div>
<div>Reveal Me</div>
</div>
CSS
body > div:first-child {
height: 800px;
background: #eee;
margin-bottom: 200px;
z-index: 1;
position: relative;
}
body > div:last-child {
background: #aaa;
height: 200px;
position: fixed;
bottom: 0;
width: 100%;
}
body > div:last-child div {
width: 80%;
margin: auto;
outline: 1px solid red; /* To show that element is horizontally centered */
}
Note: Selectors used in this answer are too general and are good for
quick demonstration purposes, in real projects, make sure you use
specific selectors