[Solved] Fieldset does not expand in height

I tried and don't get it sorted out. I had the form working in a 3 column layout but with a fixed width. After changing to liquid the form's last fieldset does not expand with its content. I stripped it down, took off this and that but nothing helps. When I copy and paste the code into a naked structure it works as well.

3 columns problem form
stripped and working form

The CSS

*
{
margin: 0;
padding: 0;
}

html, body
{
width: 99.9%;
min-width: 775px;
max-width: 1280px;
background-color: #CFC;
font: 100% Geneva, Arial, Helvetica, sans-serif;
color: #000;
}

#page
{
width: 99.9%;
margin: 0 auto;
border: 1px solid #999;
background: #FFF;
}

#container
{
width: 100%;
background-color: #CCF;
}

#header
{
width: 100%;
}

#footer
{
clear: both;
width: 100%;
text-align: center;
}

/*********************************************** container for just the left and center columns */
#wrap
{
float: left;
width: 78%;
background-color: #FFC;
}

/********************************************************************************* left column */
#left
{
float: left;
width: 17%;
padding: 0 0 0 1%;
}

#left h3
{
font-size: 20px;
letter-spacing: .9px;
}

/********************************************************************* navigation list ***/

#left ul
{
list-style-type: none;
width: 100%;
}

#left li
{
display: block;
font-size: 14px;
}

/******************************************************************************** center column */
#content
{
float: right;
width: 80%;
padding: 0 .5%;
background-color: #CFF;
}

#content h3
{
font-size: 1.25em;
margin: 30px 0 0 0;
background: #F8B193;
letter-spacing: 1px;
}

#content h3.first
{
margin: 10px 0 0 0;
}

/**************************************************************************** #content lists ***/

#content dl
{
width: 100%;
background: #E3EFFD;
margin: 5px 0 0 0;
}

#content dl.even
{
background: none;
}

#content dt
{
font-size: .9em;
font-weight: bold;
}

#content dd
{
padding: 0;
overflow: hidden;
font-size: .75em;
}

/******************************************************* options list **/

#content ul
{
margin: 0 0 5px 0;
list-style-type: none;
width: 100%;

}

#content li
{
float: right;
display: inline;
padding: 0 2px;
background: #E3EFFD;
font-size: .5em;
}

/********************************************************************************* right column */
#right
{
float: right;
width: 22%;
}

h1
{
font-size: 2.25em;
margin: .3em;
}

h2
{
font-size: 1.5em;
margin: .2em 0;
}

a:link
{
color: #00f;
background-color: transparent;
}

a:visited
{
color: #909;
background-color: transparent;
}

p
{}

.both
{
clear: both;
height: 0;
overflow: hidden;
}

* html .both
{
display: none;
}

/**************************************************** classes ***/

.adsense
{
overflow: hidden;
}

@media print{#right, #left{display: none;}}

#footer ul
{
width: 90px;
float: right;
}

#footer li
{
list-style-type: none;
}

#footer img
{
border: 0;
width: 88px;
height: 31px;
}

/************************************************************** form account ***/
#content form
{
height: 1000px;
border: none;
}

#content fieldset
{
clear: both;
padding: 10px;
margin: 0;
}

#content legend
{
display: none;
}

#content label /** standard label **/
{
float: left;
width: 40px;
font-size: 12px;
font-weight: bold;
}

#content label.block
{
display: block;
width: 150px;
margin: 0 0 0 5px;
}

#content label.folder
{
display: block;
width: 200px;
margin: 0 10px 0 0;
}

#content label.radio /*** label for radio buttons ***/
{
float: left;
margin: 0 10px 0 0;
display: inline;
}

#content input /** standard text fields **/
{
float: left;
width: 250px;
margin: 0 0 10px 0;
}

#content input.folder
{
float: left;
width: 200px;
margin: 0 0 10px 0;
}

#content input.radio /*** radio buttons ***/
{
float: left;
display: inline;
margin: 0 10px 0 0;
width: auto;
}

#content input.submit
{
width: auto;
}

#content textarea
{
display: block;
}

#content select
{
width: 150px;
}

#content .wrap
{
margin: 16px 30px 20px 0;
float: left;
width: 300px;
}

#content form p
{
text-align: left;
font-size: 10px;
margin: 0 0 5px 0;
}

The HTML

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