Question

There is missing bottom border line gap after <dt>

what is causing this and how to fix it?

<dl class="rows">
  <dt>Full Name</dt>
  <dd>Peter Gates</dd>

  <dt>Email Address</dt>
  <dd>[e-mail]</dd>
</dl>

CSS:

<style>
    .rows dl {
        float: left;
    }

    .rows dt {
        float: left;
        clear: left;
        width: 150px;
        font-weight: bold;
        padding: 5px;
        border-bottom: 1px solid black;
    }

    .rows dd {
        width: 150px;
        float: left;
        padding: 5px;
        border-bottom: 1px solid black;
    }
</style>

Feel free if css can be impoved and reduced.

Answer 1

Specifically, you need to add margin: 0 to .rows dd.

This is how I’d write/improve your CSS (with the fix):

See: http://jsfiddle.net/gw4zW/3/

.rows {
    float: left;
}
.rows dt, .rows dd {
    float: left;
    width: 150px;
    padding: 5px;
    margin: 0;
    border-bottom: 1px solid black;
}
.rows dt {
    clear: left;
    font-weight: bold;
}