CSS for forcing browser default font

gistfile1.txt

@namespace url(http://www.w3.org/1999/xhtml);

html, body
 {
    font-size: medium !important ;
    font-family: normal !important ;
    line-height: 1.33em !important ; /* Change 2011-12-28: FF 9 no longer does "normal" correct here */
  /*   margin: unset !important; */
}

input, textarea
, table tbody tr td
, p, td, tr, div, font, label, a
{
    font-size: medium !important ; 
    line-height: inherit !important;
}

/* Notes on the above:
"medium" == browser specified default
"100%" == outer container size (usually CSS'd smaller)
16pt == a font size.

What that says: Default the page to my size, not the site's size; then, allow changes that I set to be kept.

Yes, it's odd. No, it's not perfect.
*/

.smalltext { /* Known to be used on an SMF site; seems "generic" enough. */
    font-size: small !important ;
    font-family: inherit !important ;
    line-height: 1.33em !important ; 
}

#bodyContent /* Wikipedia, also "generic" */
, .postbody /* Seen on some forums */
, .messageText /* also on some forums */
, .message /* ditto */
, .messageInfo
{
    font-size: medium !important ;
    font-family: inherit !important ;
    line-height: 1.33em !important ; 
}

.page, .pageWidth
{
 /*   margin: unset !important; */
}

body
{
    /* padding-left: 5px; */
    width: 100% !important;
}

body.div
{  /* Does not work, sadly. Still have things declaring 95%, etc. */
    width: 100%!important;
}

.post
{
    overflow: unset;
}