Twitter Bootstrap changes rendering of fieldset legend, why?

Question

In this ASP.NET MVC 3 project, I've just started experimenting with Twitter Bootstrap, but I notice it messes with the rendering of <fieldset> legends. What is happening to the legend rendering here, and how do I get it back to normal? That is, I want the right line to be vertically aligned with the left line again.

The standard legend rendering, pre-Bootstrap, to the left, Bootstrap-affected rendering to the right:

Update: I've found out what's causing the broken rendering, at least: Bootstrap changes the legend's width property to 100% and the border-bottom property to '1px solid'. This causes the original border to the right of the legend to be erased and a border beneath it to appear instead. The question is how this is meant to work. Maybe MVC's CSS (Site.css) is interfering with that of Bootstrap?

Answer 1

If you switch your stylesheet declarations so that the bootstrap is last it should correct the issue, ie:

<link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />
<link href="@Url.Content("~/css/bootstrap.min.css")" rel="stylesheet" type="text/css" />

Bootstrap styles

fieldset {
    padding: 0;
    margin: 0;
    border: 0;
}

legend {
    display: block;
    width: 100%;
    padding: 0;
    margin-bottom: 27px;
    font-size: 19.5px;
    line-height: 36px;
    color: #333;
    border: 0;
    border-bottom: 1px solid #E5E5E5;
}

default MVC Style.css styles

fieldset {
    border: 1px solid #DDD;
    padding: 0 1.4em 1.4em 1.4em;
    margin: 0 0 1.5em 0;
}

legend {
    font-size: 1.2em;
    font-weight: bold;
}

end result should look like:

vs the other way around (MVC default styles declared last)

Alternatively, get rid of the MVC stylesheet altogether and use bootstrap along with whatever custom styles you need.