Huge font in my Manifest wordpress.org site

My website is bigbigwednesday.com.

and, as you can see, the font is gigantic. Everything looks fine on my PC, which is where I have been editing the page, and then last night, after inserting a buynow button and trying to make the font on that page the same as the other pages, something happened and now the font for everything is HUGE. I went into the appearance editor and changed the font size, which was 100% to 50%, and nothing changes (see code below):

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td {
margin: 0;
padding: 0;
border: 0;
outline: 0;
font-size: 50%;
vertical-align: baseline;
background: transparent;

Any tips? I’m so new to this, so I don’t know what I’m doing! Thank you!