div padding, margin?

Question

I am a iPhone developer stuck with some basic CSS properties ;) I want to show something like this:

This is what I have:

<div class="cell">
    <div class="cell_3x3_top">
        <div class="cell_3x3_type rounded_left">type</div> <!--UPDATED:2010/09/29-->
        <div class="cell_3x3_title rounded_right">title</div><!--UPDATED:2010/09/29-->
    </div>
    <div class="cell_3x3_content rounded_left rounded_right">content</div><!--UPDATED:2010/09/29-->
</div>

and the css:

div.cell_3x3_top{
    height:20%;
    margin: 0 0 0 0;
    padding: 0 0 0 0;
    border: none;
    margin-bottom: 1px; /*to compensate space between top and content*/
    text-align: center;
    vertical-align: middle;


}
div.cell_3x3_type{
    width:20%;
    float:left;
    background-color: inherit;
    margin-right: -2px; /*UPDATED:2010/09/29*/
}
div.cell_3x3_title{
    width:80%;
    float:left;
    background-color: inherit;
    margin: 0 0 0 0;  /* maybe not neccesary*/
    padding: 0 0 0 0; /*maybe not neccesary*/
    margin-left: -1px; /*UPDATED:2010/09/29 */

}
div.cell_3x3_content{
    height:80%;
    background-color: inherit;
}

But when I render my content with above code title div seems to be too large and it appears underneath type div, Why is this? type div is 20% width, title is 80% width so it should be 100% exactly. Is any margin or other metric I am forgetting here? I have tried to move title div to the left using margin but is still buggy. I wonder what is the correct way of getting something like the picture? (Not exactly because if you look closer title div is a little bit shorter than it should be. See that its right border is not aligned with content div.)

Thanks in advance.

EDIT: 2010/09/28

This is actually what I want to achieve:

and this is what I have:

Above code (updated a little bit) would work if I wouldn't have bordered divs. Since border width is 1px what I need is to set type div width to 20%-2px (left border + right border = 2px) and title div to 80%-2px

.rounded_left{
    border-top-left-radius: 4px 4px;
    border-bottom-left-radius: 4px 4px;

    border-color:gray;
    border-width: 1px;
    border-style:solid;
}

(.rounded_right is similar)

This is not related to clear:both property I believe. I tried and didn't had any effect since my content div was good form the beginning.

In short: How can I make a div including its border to be let's say exactly 20% width?

Ignacio

ANSWER:

I realized that a wrapper div around type and title respectively solves the problem. So my answer is kind of like this:

<td class="cell">
<div class="cell_3x3_top bordered">
<div class="cell_3x3_type_container"><div class="cell_3x3_type rounded_left full_height">6</div></div>
<div class="cell_3x3_title_container"><div class="cell_3x3_title rounded_right full_height">title</div></div>                                                               </div>
<div class="cell_3x3_content rounded_left rounded_right">content</div>
</td>

I set 20% and 80% in the containers and the borders in the inner div.

Answer 1

You are missing a clearing div. The floating elements do not expand the .cell_3x3_type div as you would expect. Try this instead:

<div class="cell">
    <div class="cell_3x3_top">
        <div class="cell_3x3_type">type</div>
        <div class="cell_3x3_title">title</div>
        <div class="cell_3x3_clear"></div>
    </div>
    <div class="cell_3x3_content">content</div>
</div>

CSS:

div.cell_3x3_clear  {
  clear: both;
}

The rest remains the same.

EDIT:
A small explanation of what the clear property does: consider a container div that contains only floated elements, like this (using inline CSS for clarity):

<div id="container" style="border: 1px solid green;">
  <div style="float: left; height: 30px; width: 30px; border: 1px solid red;"></div>
  <div style="float: left; height: 20px; width: 20px; border: 1px solid blue;"></div>
</div>

_{(source: fii.cz)}

The height of the container div is 0 because the floating elements are taken out of the document flow and do not affect the height of their container anymore. The clear: both property on an element "clears" all floats, i.e. makes sure that the element is placed below all floating elements that precede it:

<div style="float: left; height: 30px; width: 30px; border: 1px solid red;"></div>
<div style="float: left; height: 20px; width: 20px; border: 1px solid blue;"></div>
<div style="clear: both; height: 10px; width: 50px; border: 1px solid black;">Cleared</div>

_{(source: fii.cz)}

If you combine the two above examples, you can force the container div to have its height equal to the height of the highest floating element in it:

<div id="container" style="border: 2px solid green;">
  <div style="float: left; height: 30px; width: 30px; border: 1px solid red;"></div>
  <div style="float: left; height: 20px; width: 20px; border: 1px solid blue;"></div>
  <div style="clear: both; height: 0px; border: 1px solid black;"></div>
</div>

_{(source: fii.cz)}