I have a div with 2 other divs within. The border of the outermost div does not encompass the 2 content divs. Why is this?
<div id="baseDetails" style="top:1011px;left:476.5px;width:510px;border:2px brown solid;">
<div id="baseTab" style="float:left;width:180px;margin:0 auto;border-right:1px solid #bbb;padding:10px;margin-right:20px;">
<div>
<h5>BASE DATA</h5>
<dl>
<dt>Base location:</dt>
<dd>UK</dd>
<dt>ID:</dt>
<dd>0065</dd>
</dl>
</div>
<div>
<h5>DETAILS</h5>
<dl>
<dt>Gender:</dt>
<dd>Male</dd>
<dt>Date of Birth:</dt>
<dd>1763</dd>
<dt>Place of Birth:</dt>
<dd>Manchester</dd>
<dt>Occupation:</dt>
<dd></dd>
<dt>Date of Death:</dt>
<dd>1823</dd>
<dt>Place Interred:</dt>
<dd>Liverpool</dd>
</dl>
</div>
<div>
<h5>PLACES:</h5>
<dl><dt>No Data:</dt>
<dd>BIRTH - 1823</dd>
</dl>
</div>
</div>
<div id="bio_div" style="width:230px;display:inline;padding:10px;margin:20px;">
<h5 id="bio">BIOGRAPHY</h5>
<div id="bio_main" style="column-count:1;">We have no details for this person.<br>If you can help, please provide biographical information to the manager for inclusion.</div>
</div>
</div>