I am currently using twitter bootstrap, which is working nicely, but I would like to add a legend to the “well” elements that are used in a form (so that I can have multiple wells, denoting sub-sections on a form).
An example of what my form looks like now is:

I would like to add a legend so that I can have two separate sections beneath the “Details” heading, for example, but be able to denote what they are for. A legend seems the best way to do this.
The relevant section of the html looks like:
<form>
<div class="row">
<div class="span6">
<div class="nonboxy-widget">
<div class="widget-head">
<h5>Details</h5>
</div>
<div class="widget-content">
<div class="widget-box">
<div class = 'form-horizontal well'>
<fieldset>
<div class="control-group">
<label class="control-label">Sale Type</label>
<div class="controls">
When I attempt to add a legend tag to either the fieldset or the div with class form-horizontal well it renders like a heading inside the box, not like a normal html legend. It renders like:

with the code
<div class = 'form-horizontal well'>
<fieldset>
<legend>Details</legend>
<div class="control-group">
Can anyone recommend a way to get this to render like a normal legend, on the border of the box?
EDIT: Thanks to the code from Simbirsk, I now have:

This is pretty close, but what I wanted was to have the legend look like a normal html legend on a fieldset (i.e. for it to sit in the border), so I changed the CSS to:
legend {
padding: 0;
margin-left: 10px;
margin-bottom: -9px;
border: 0;
color: #999999;
background-color: #333333;
}
but that resulted in this:

How can I ensure that the border on the well “breaks” (is not displayed behind the text) like a normal fieldset legend?
EDIT 2: Following the edit to the first answer, I applied the code to my css and ended up with:

You will note this is not quite what I was looking for – I am trying to get the legend on the border of the well div, not on the fieldset itself (because this is a nested form, there could be multiple fieldsets within one well, so I can’t put the border on the fieldset itself).
I seemed to have achieved this with the code above, the only problem was putting a break in the border where the legend is – can this be done with some kind of opacity to the background of the legend text, and a bit of padding?
Any further suggestions?
Thanks!
Put the
.wellon thefieldsetand override Bootstrap’slegendandfieldsetstyles.HTML
CSS
NOTE: I’ve ommited Bootstrap classes like rows, spans, controls, etc. Use them to fit your layout.
EDIT: Changed code to include
fieldsetstyles “reset”.