Divide div to left, right , bottom in html - html

Question

This is the layout i want,
I made some with code, but i'm not sure how to do after this.
[html]
<div id="content">
<div id="left">left</div>
<div id="right">right</div>
<div id="bottom">bottom</div>
</div>
[css]
#content{
/* the width in here will be changed
width: this requirment will be changed
i dont' want to type my left, right content static
is there a way? */
}
#left{
float:left;
width: 50px;
}
#right{
float:left;
width: 50px;
}
#bottom{
/*what do i have to do in here?
float:*/
}

Answer 1

You could do something like this:
Set clear:both on #bottom. Add width:50% to both #left/#right.
Finally, specify the borders on the elements and add box-sizing in order to include the borders in the element's width calculations.
jsFiddle example
#content {
border:1px solid black;
}
#content > div {
height:100px;
box-sizing:border-box;
-moz-box-sizing:border-box;
}
#left {
float:left;
width: 50%;
border-right:1px solid black;
}
#right {
float:right;
width: 50%;
}
#bottom {
border-top:1px solid black;
clear: both;
}

Answer 2

This is what you want for the bottom div:
#bottom{
clear: both;
}

Answer 3

For #bottom, you want float:left;width:100px; Just try that, see if it works.
You could also try using positions to do it, if you don't need the size of them to change:which it looks like you don't. For example:
#Left {width:50px;height:50px;position:absolute;left:0px;top:0px;}
#Right {width:50px;height:50px;position:absolute;left:50px;top:0px;}
#Bottom {width:100px;position:absolute;left:0px;top:50px;}
I feel much more confident the second will work.

Answer 4

Here is how I would do it personally: http://jsfiddle.net/T5fW3/
<div id="content">
<div id="top">
<div id="left">
<div class="container"> Left </div>
</div>
<div id="right">
<div class="container"> Right </div>
</div>
</div>
<div id="bottom">
Bottom
</div>
</div>
I use a container so that if you want to add styles (border, margins, padding etc) they don't mess up the 50%. You can now resize content to whatever size and your proportions will still be the same.
#content{
/* the width in here will be changed
width: this requirment will be changed
i dont' want to type my left, right content static
is there a way? */
}
#left{
float:left;
width: 50%;
}
#right{
float:left;
width: 50%;
}
#bottom{
border: 1px solid black;
clear: both;
}
.container {
border: 1px solid black;
}
the border in the container class and bottom id is there just for illustration. If you were to add the border to #left or #right your layout will break. Notice also, I use 50% instead of 50px.