How do I bold fonts in my theme?

style.css of your theme:

/* RESET */
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, strong, li,
fieldset, form, label, legend,
caption, tbody, tfoot, thead, dl, dt, dd {
	margin: 0;
	padding: 0;
	border: 0;
	outline: 0;
	font-weight: inherit;
	font-style: inherit;
	font-size: 100%;
	font-family: inherit;
	vertical-align: baseline;
	}

remove strong, from the list

*sigh* Why do some theme developers use such bad reset CSS?

Try editing your theme’s style.css file and adding:
strong{font-weight:bold;}
to the very bottom of the file.

Thank you both! I tried esmi’s first and it worked great. I bet the alchymyth’s would work, too. Thank you, thank you!

alchymyth’s fix was just as good and perhaps a little cleaner than mine.