I am using ems for font sizes (1.25) but the font size is different in different divisions.

First Division is a paragraph, second an ordered list and third a paragraph. You can see the html code here

The css code is

Code:
#main-box {text-align: left;
    font-family: arial,san-serif;
    font-size: 1.25em;
    color: black;
   }
#listd {font-family: arial,san-serif;
    font-size: 1.25em;
    color: black;
    }
#main-bxd { text-align: left;
    font-family: arial,san-serif;
    font-size: 1.25em;
    color: black;
    }
How do I resolve this? Thanks.