[joeroberts]

ok I found your trouble maker
open phpBB3/styles/Prospace/theme/common.css and find

* {
    /* Reset browsers default margin, padding and font sizes */
    margin: 0;
    padding: 0;
}

and replace with

* {
    /* Reset browsers default margin, padding and font sizes */
    /*margin: 0;
    padding: 0;*/
}

now find

body {
    /* Text-Sizing with ems: http://www.clagnut.com/blog/348/ */
    font-family: Verdana, Helvetica, Arial, sans-serif;
    color: #E7C292;
    background-color: #FFFFFF;
    /*font-size: 62.5%;             This sets the default font size to be equivalent to 10px */
    font-size: 10px;
    margin: 0;
    padding: 12px 0;
}

and replace with

body {
    /* Text-Sizing with ems: http://www.clagnut.com/blog/348/ */
    font-family: Verdana, Helvetica, Arial, sans-serif;
    color: #E7C292;
    background-color: #FFFFFF;
    /*font-size: 62.5%;             This sets the default font size to be equivalent to 10px */
    font-size: 10px;
    margin: 0;
    /*padding: 12px 0;*/
}