Font acting differently on IE and Firefox

Font acting differently on IE and Firefox

I have created a simple page with a div having text in it, the problem is
when running in IE it is consuming 2nd line while when running in Firefox
or Chrome it fits in single line.
Is there anyway to rectify this, or do you see anything in style that I
have done wrong? If no then kindly explain why this is happening.
Following is the html and style
<div class="Footer">
Hi my name is Mutahar, This message was sent from Superman Computer
Systems located at 1705 From, Markham, ON.
* {
color: #101010;
font-family: tahoma;
font-size: 12pt;
}
.Footer {
color: #404040;
font-family: tahoma;
font-size: 10pt;
padding: 20px;
text-align: left;
width: 700px;
}