You should wrap them in a div with no float.
<div style="float:none;background:#FDD017;" class="clearfix">
<div id="response" style="float:left; width:65%;">Response with two lines</div>
<div id="note" style="float:left; width:35%;">single line note</div>
</div>
I also use the clearfix patch on here http://www.webtoolkit.info/css-clearfix.html