CSS edits suddenly not working

Yesterday, when I added:
body {
font-size: small;
}
to the default light CSS, the fonts sized down universally.
Today, not so much. I have not changed anything else in the CSS. Any thoughts why this might be happening?
Eugene
body {
font-size: small;
}
to the default light CSS, the fonts sized down universally.
Today, not so much. I have not changed anything else in the CSS. Any thoughts why this might be happening?
Eugene