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Make floated element have height 100% to fill page

I am trying to get the left side bar to have a height of 100% and fill the page no matter how big the "main" div is made.
At the moment it stops at normal page height and doesn't increase height.
Is there any way I can achieve this?
JFiddle: https://jsfiddle.net/hjnheonk/
HTML:
<div class="container">
<div class="navbar-left">
<div id="top">
<h2><b>Admin</b>Panel</h2>
</div>
<div id="navigation">
<ul>
<li class="nav-header">Main Pages: </li>
<li>
Home
etc ...
</ul>
</div>
</div>
<div id="navbar-top">
<div id="user">
<?php echo'<p id="user_greeting">'.$username. '<span class="fa fa-caret-down"></span>'.'</p>'?>
</div>
<div id="icon">
<span>
<hr><hr><hr>
</span>
</div>
<div class="main">
</div>
</div>
</div>
**CSS: **
html,body {
height: 100%;
}
.container {
margin-left: 230px;
height: 100%;
position:relative;
}
.navbar-left {
background-color:rgb(26, 34, 38);
color:white;
width: 230px;
margin-left: -230px;
height: 100%;
float:left;
}
.navbar-left #top {
background-color:#367fa9;
min-height: 50px;
text-align: center;
}
.navbar-left #top h2 {
font-size: 20px;
padding: 15px 0px;
}
#navbar-top {
float:right;
width: 100%;
position:relative;
background-color:#3c8dbc;
width: 100% !important;
margin:0 auto;
border: none;
min-height: 51px;
}
#navbar-top #icon {
width: 20px;
padding: 18px 10px !important;
}
#navbar-top #icon hr {
margin:0 auto;
padding: 0px;
border: 1px solid white;
border-radius: 5px;
}
#navbar-top #icon hr:not(:first-child) {
margin-top: 5px;
}
#navbar-top > div:hover:not(#userDropdown) {
background-color:#47a0d3;
cursor: pointer;
}
#brand {
float:left;
}
#navigation .nav-header {
background-color: #272f33;
padding: 12px 30px;
text-align: left;
margin-top: 40px;
margin-bottom: 25px;
}
#navigation ul li a:hover {
background-color: #273136;
}
#navigation ul li a {
width: 100%;
display: block;
padding: 12px 0px;
background-color: #1a2226;
text-align: center;
color:white;
text-decoration: none;
}
.main {
float:left;
width: 100%;
background-color:pink;
height: 1000px; /*Used as an example to show */
}

There's no way to do this by pure CSS, they way you coded-sliced it. If you want it to make work with the current layout - calculate the height via JS, based on the contents and height of the right column.
Basically in your case there different ways to proceed:
calculate the height via JS, based on the contents and height of the right column.
to nest DIVs. So one div will stretch it's parent. Then it will be possible to use purely CSS solution. Read more here one of the possible solutions.
to "override" the standard behavior of divs with "display:table-cell;" (table, table-row, etc), or even to use modern features of CSS alike flexboxes
Which way to go, is up to you.

Does the container need to be defined as percentage? If not then you could do something like this:
$('.navbar-left').css('height', $('.container').height()+'px');

Using Farside's method and updating a little bit here is my code:
var column = $(".column_left").height() + "px";
$(".column_right").css({"height": column});
$(window).on('resize', function(){ //accounts for if the user resizes the window, column stays in place.
var column = $(".column_left").height() + "px";
$(".column_right").css({"height": column});
});

Here is a Pure CSS way to acheive the same.
JS Filddle: https://jsfiddle.net/cx6nu8sw/
Following are the classes from your code which are changed
#navbar-top {
width: 100%;
position:relative;
background-color:#3c8dbc;
margin:0 auto;
border: none;
min-height: 51px;
display:table-cell;
vertical-align:top;
}
.navbar-left {
background-color:rgb(26, 34, 38);
color:white;
display:table-cell;
vertical-align:top;
}
//newly addition
#navigation{
width:230px;
}
As mentioned by #Farside in his 3rd point, I have used "display:table-cell;" on your Div's. Its same as creating table, where the height of row is decided by the longest content in the entire row.
But, be aware that width & height of elements with "display:table-cell;" cannot be forced, it will adjust according to the content inside them. So you can set width and height of elements inside them it will automatically take the same height and width.

Want to arrange css divs in a proper way

Please, Please answer / help me.
I have three divs with CSS and it is generated dynamically.
And I call them wincontainer, smalldiv and largediv. wincontainer is a container of smalldiv and largediv as we can see in the image.
properties of divs
<!-- wincontainer -->
<ol class="wincontainer" style="width: 938px;float: left;border: 2px solid #CCC;"></ol>
<!-- smalldiv -->
<div id="smalldiv" style="
width: 420px;
margin: 10px;
margin-top: 10px;
background-color: #ffffff;
font-size: 13px;
text-align: justify;
word-wrap: break-word;
font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
border: 1px solid #BFBFBF;
float: right;
clear: right;"> </div>
<!-- largediv -->
<div id="largediv" style="
width: 408px;
margin: 10px;
margin-top: 10px;
background-color: #ffffff;
font-size: 13px;
min-height: 50px;
text-align: justify;
word-wrap: break-word;
font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
box-shadow: 0px 1px 1px #CCC;
border: 1px solid #BFBFBF;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;">
As we can see we have 2 largedivs and 4 smalldivs which is dynamically generated yet
Question: I want to arrange small and large div in a proper way. As like this picture. fig (1). but they are coming like as fig (2)
As i said I cannot create sub wrappers because they are dynamically and very important serial wise generated...if i make the subwrapper then it cant be in serial wise
Note: I can not make another special div to contain smalldiv or largediv to separate it, because that small and large div is in a serial wise so we cant put them in a special container and they are dynamic.
In JSFIDDLE -> http://jsfiddle.net/jwy3c3n5/ when you delete the upper most smalldiv then it will work fine but when you add smalldiv on top it goes mad.. i want to fix it and make it proper way at unlimited div
a div will either be largediv or smalldiv, there will could be a variable number of each and can appear in any order. All largediv and smalldiv are contained within wincontainer. Additional markup is not allowed.

Here's an option that requires JavaScript:
$(document).ready(function(){
var containerTop = $('.container')[0].offsetTop,
lpos = containerTop,
rpos = containerTop;
$('.container > div').each(function(){
var $el = $(this),
el = $el[0];
if($el.hasClass('large')){
if(lpos < el.offsetTop){
$el.css('margin-top', (lpos - el.offsetTop) + "px");
}
lpos += $el.height();
}else if($el.hasClass('small')){
if(rpos < el.offsetTop){
$el.css('margin-top', (rpos - el.offsetTop) + "px");
}
rpos += $el.height();
}
});
});
.container{
}
.container > div{
width:50%;
box-sizing:border-box;
position:relative;
}
.container .large{
height:400px;
display:inline-block;
float:left;
clear:left;
position:relative;
}
.container .small{
height:150px;
display:inline-block;
float:right;
clear:right;
position:relative;
}
.red{background-color:red}
.blue{background-color:blue}
.green{background-color:green}
.yellow{background-color:yellow}
.purple{background-color:purple}
.orange{background-color:orange}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class='container'>
<div class='large red'></div>
<div class='small blue'></div>
<div class='small green'></div>
<div class='large yellow'></div>
<div class='small purple'></div>
<div class='small orange'></div>
</div>
note: I think it would be better to use a div for your "wincontainer" than an ordered list.

I haven't tried this in a similar stituation, but you could set display:inline-block on largediv and smalldiv. Maybe that would do it.
Edit: and remove the float attribute. But now that i think about it, depending on the order of the divs, this could not be the best solution.

You need to change the id's to classes on your dynamic divs, and then layout the code to flow in div order.
Your css and html worked really.
See the fiddle
http://jsfiddle.net/jwy3c3n5/2/
<div id="container">
<div id="leftwrapper">
<div class="large">test<br />test<br />test<br />test<br />test<br /></div>
<div class="large">testtest<br />test<br />test<br />test<br /></div>
</div>
<div id="rightwrapper">
<div class="small">test</div>
<div class="small">test</div>
<div class="small">test</div>
<div class="small">test</div>
</div>
</div>
#container {
width: 500px
}
#rightwrapper {
float: right;
width: 35%;
}
#leftwrapper {
float: left;
width: 55%;
}
.large {
background: gray;
margin-bottom:10px;
}
.small{
background: gray;
margin-bottom:10px;
}

I created a js-fiddle with the information you provided, plus a small edit on the margin for the large div, and the layout appears to be behaving the way you want it to.
Here is the example: http://jsfiddle.net/uaeb0Lmv/
I revised the margins as such:
#largediv {
margin: 10px 30px 30px;
}
For some reason, the follow-up top margin didn't override the original declaration. Let me know if that works for you. Otherwise, we may need more info on the div contents.

I understand your problem and i try to solve your problems. You can use this code. It is working.
Live Working Demo
HTML Code
<div id="main">
<div id="one"></div>
<div id="two"></div>
<div id="three"></div>
<div id="four"></div>
<div id="five"></div>
<div id="six"></div>
</div>
CSS Code:
#main
{
height:410px;
width:450px;
border:5px solid black;
}
#one
{
height:150px;
width:150px;
background-color:red;
border:5px solid black;
position:relative;
margin-left:20px;
margin-top:20px;
}
#two
{
height:150px;
width:150px;
background-color:green;
border:5px solid black;
margin-top:20px;
position:relative;
float:left;
margin-left:20px;
margin-top:20px;
}
#three
{
height:60px;
width:200px;
background-color:blue;
border:5px solid black;
margin-left:20px;
margin-top:10px;
position:relative;
float:left;
display:table-cell;
margin-top:-160px;
}
#four
{
height:60px;
width:200px;
background-color:gold;
border:5px solid black;
margin-left:20px;
margin-top:10px;
position:relative;
float:left;
display:table-cell;
margin-top:-60px;
}
#five
{
height:60px;
width:200px;
background-color:purple;
border:5px solid black;
position:relative;
float:left;
display:table-cell;
margin-top:40px;
margin-left:-210px;
}
#six
{
height:60px;
width:200px;
background-color:gray;
border:5px solid black;
margin-left:-210px;
margin-top:140px;
position:relative;
float:left;
display:table-cell;
}
Result:

How to freeze a table header and everything above it when scrolling down?

I've been struggling with trying to freeze a table header and everything above it.
I've published a similar question and got an answer which I thought was good but eventually didn't do the trick.
Don't need cross browser support, just google chrome.
I'm trying to get this part of the html frozen when scrolling down:
<input>input1</input>
<input>input2</input>
<button>A</button>
<button>B</button>
<button>C</button>
<button>D</button>
<tr><th>header1</th><th>header2</th><th>header3</th><th>header4</th><th>header5</th></tr>
Here is the fiddle (please publish a fiddle basing on it with the answer):
jsfiddle
Thanks

Copy and paste this:
<div style="position:fixed; height:40px;">
<input>input1</input>
<input>input2</input>
<button>A</button>
<button>B</button>
<button>C</button>
<button>D</button>
<table >
<tr ><th>header1</th><th>header2</th><th>header3</th><th>header4</th><th>header5</th></tr>
</table>
</div>
<p style="height:2000px; padding-top:150px;">hello</p>

.header-cont {
width:100%;
position:fixed;
top:0px;
}
.header {
height:52px;
background:#FFFFFF;
margin:0px auto;
}
.content {
width:960px;
background: #FFFFFF;
margin: 30px auto;
}
table {
border-collapse:collapse;
}
td ,th{
text-align: center;
border-bottom: 2px solid black;
border-top: 2px solid black;
border-left: 2px solid black;
}
#t1 tr td{
visibility:hidden;
}
#t2{
padding-top: 42px;
display: block;
}
Here is a Demo

CSS window width resize issues

I am having problems with some content not fixed into one place when I resize the window on a browser, I basically have 3 div id box elements placed next to each other.
They are positioned fine however when I resize the screen they seem to fall below one another.
I have min-width: 947px; in the body of the CSS however this does not do anything.
HTML:
<div id ="featured1">
</div>
<div id ="featured3">
</div>
<div id ="featured2">
</div>
CSS:
#featured1{
float:left;
font-family: 'Lobster13Regular';
font-size:35px;
color:#9c5959;
margin-top:20px;
margin-left:150px;
border:1px solid black;
width:250px;
height:150px;
}
#featured2 {
display: inline-block;
font-family: 'Lobster13Regular';
font-size:35px;
color:#9c5959;
margin-top:20px;
border:1px solid black;
width:250px;
height:150px;
}
#featured3 {
float:right;
font-family: 'Lobster13Regular';
font-size:35px;
color:#9c5959;
margin-top:20px;
border:1px solid black;
width:250px;
height:150px;
margin-right:200px;
}
For some reason when I try resizing the screen with this code the elements fall below each other, I am looking for the content to completely remain the same and not resize at all.

Here is the working example: jsFiddle link
use
display: inline-block;
on all 3 divs, then they wont go down.
Note: this property will not work on IE7 and smaller versions.
You have given your body a min-width:947px but the actual width occupied by all divs including the margin and borders, etc is 1150px.
Thats why its breaking.
Please add vertical-align: top; property on all the divs

This should help. FYI. When writing in CSS make sure you minify the code. Google developer has a great section on this (https://developers.google.com/speed/pagespeed/service/MinifyCSS).
HTML:
<div id="container">
<div id="featured1">
Featured 1
</div>
<div id="featured2">
Featured 2
</div>
<div id="featured3">
Featured 3
</div>
</div>
CSS:
#container {
position: absolute;
width: 836px;
height: 190px;
}
#featured1, #featured2, #featured3 {
position: relative;
font-family: 'Lobster13Regular';
font-size: 35px;
float: left;
left: 20px;
top: 20px;
width: 250px;
height: 150px;
border: 1px solid #000;
overflow: hidden; /*Remove if you are not going to overflow text in each element*/
}
#featured2, #featured3 {
margin-left: 20px;
}

Is it possible to have a non-rectangular div?

I need to shape ONE div tag in the following shape:
Is it possible to make it cross browser? I don't necessarily need rounded corners. I need it so I can change the color of the borders of the whole div on hover, so I assume it can't be achieved by using two divs.

Yeah, you can do that using HTML and CSS like this: http://jsfiddle.net/broofa/364Eq/
It's essentially using three divs to aggregate the mouse events, like so:
<div id="outer">
<div class="inner"></div>
<div class="inner"></div>
</div>
And I use a :hover rule on the outer element to affect the border colors on the inner divs:
#outer .inner {border-color: red}
#outer:hover .inner {border-color: blue}
The only quirk with this markup is that the content area - the area you drew in your image - is that it's two divs, not one. So text won't wrap and flow the way you might expect. Also, this may not work so well on older (IE6-7) browsers. But FF, Chrome, Safari, Opera should probably be okay.

A one div solution using pseudo elements:
/* relevant styles for shape */
.tab {
border-top-left-radius: 0px;
margin-left: 100px;
}
.tab:before {
content:"";
display: block;
position: relative;
height: 50px;
width: 50px;
right: 52px; /* width + border width */
top: -2px;
background-color: white;
border: inherit;
border-right-width: 0px;
border-top-left-radius: 5px;
border-bottom-left-radius: 5px;
}
/* styles to look like example */
div{
box-sizing: border-box;
background-color: white;
border: 2px solid red;
height: 100px;
width: 200px;
border-radius: 5px;
}
div:hover {
border-color: green;
}
<div class="tab"></div>

See this jsFiddle example:
<div id="main">
<div id="div1" class="border">
</div>
<div id="div2" class="border">
</div>
</div>

You can either use a map or use 2 divs and alter the borders so it looks like one shape.

two options that I can think of:
1) give the div a background image and use CSS pseudo class :hover to change the background image to one that indicates a hover state
2) put three div's inside a wrapper, and position them so so you have one in the upper left hand corner, and then two stacked on top of each other, so that you can simulate the top half of a larger div missing the upper left half border. I don't think CSS alonw can target all the divs in order to change their borders, so will probably have to use JS to execute the hover behavior, by applying an event handler to all three divs.

No. Divs are ALWAYS rectangular. You could fake it in a number of ways (using a background image would be one option).
As for using two DIVs, sure you could. The hover could be done with CSS3 and child selectors of a parent div or you could JavaScript to change the class of both divs when hovering over either one of them.

Definitely requires two or three div's unless you use a background image
Here's a three-div solution
http://jsfiddle.net/pxfunc/SUuF6/
Its cross-browser compatible. The hover won't work in IE6, but it will in IE7+. The rounded corners will show based on browser support
HTML:
<div id="fancyShape">
<div id="main"><div></div>
<div id="panHandle"></div>
</div>
CSS:
#fancyShape {position:relative;width:504px;height:304px;}
#main {
margin-left:100px;
width:400px;
height:300px;
border:solid 2px #000;
border-radius:0 15px 15px 15px;
}
#panHandle {
width:100px;
height:120px;
position:absolute;
top:0;left:0;
border-top:solid 2px #000;
border-left:solid 2px #000;
border-bottom:solid 2px #000;
border-radius:15px 0 0 15px;
}
/* hover effect */
#fancyShape div {background-color:#fff;}
#fancyShape:hover div {background-color:#ff0;border-color:red;}

Perhaps you could use Border-radius along with 2 or 3 div's to get the look you want. The only issue then is it's not supported in all browsers.

Use multiple divs, as others have suggested.
http://jsfiddle.net/thomas4g/7B5MA/14/
Keep in mind that it'll be very hard to flow content in this.

<!DOCTYPE HTML>
<html>
<head>
<style>
html{height: 100%; width: 100%;}
body{height: 100%; width: 100%;}
#wrapper{
position: relative;
top: 50px;
right: 25%;
width: 565px;
height: 440px;
margin: 0 auto;
padding: 0px;
}
#left{
position: absolute;
width: 100px;
height: 50px;
border: 2px solid black;
border-right: none;
-moz-border-radius-bottomleft: 10px;
border-bottom-left-radius: 10px;
-moz-border-radius-topleft: 10px;
border-top-left-radius: 10px;
background-color: #ffffff;
}
#right{
position: absolute;
left: 100px;
width: 440px;
height: 440px;
border: 2px solid black;
-moz-border-radius: 10px;
-moz-border-radius-topleft: 0px;
border-top-left-radius: 0px;
border-radius: 10px;
padding-left: 25px;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"> </script>
<script type="text/javascript">
$(document).ready(function(){
$('#wrapper').hover(
function () {
$(this).children('#left').css({'border':'2px solid red', 'border-right':'none'});
$(this).children('#right').css({'border':'2px solid red'});
},
function () {
$(this).children('#left').css({'border':'2px solid black', 'border-right':'none'});
$(this).children('#right').css({'border':'2px solid black'});
});
});
</script>
</head>
<body>
<div id="wrapper">
<div id="right">Some content here</div>
<div id = "left"></div>
</div>
</body>
</html>
You can use CSSPIE for rounded orners for IE