Boldface fonts for O'Reilly online books by averyroffman

/* ==UserStyle==
@name           Boldface fonts for O'Reilly online books
@namespace      github.com/openstyles/stylus
@version        1.0.0
@description    Changes the font style of the main text from hard-to-read roman styles to more eye-friendly, bolder ones such as Helvetica and Arial on the desktop browser version of O'Reilly online book site (formerly Safari Books Online).
@author         Minoru Mizutani
@license        CC-BY-SA-4.0
==/UserStyle== */

@-moz-document domain("learning.oreilly.com") {
	#sbo-rt-content pre,
	.scalefonts #sbo-rt-content pre {
			font-family: Menlo, Monaco, monospace !important;
	}
	#sbo-rt-content,
	#sbo-rt-content p,
	#sbo-rt-content div > p,
	#sbo-rt-content p.para_indented,
	#sbo-rt-content div.chp .para_indented,
	#sbo-rt-content .indent,
	#sbo-rt-content .noindent,
	#sbo-rt-content .p,
	#lesson-fragment,
	#lesson-fragment p,
	#lesson-fragment div > p,
	#lesson-fragment p.para_indented,
	#lesson-fragment div.chp .para_indented,
	#lesson-fragment .indent,
	#lesson-fragment .noindent,
	#lesson-fragment .p,
	#sbo-rt-content .application,
	#sbo-rt-content .calibre4,
	#sbo-rt-content .cf,
	section.chapter p,
	.scalefonts #lesson-fragment div div,
	.scalefonts #lesson-fragment div p,
	.scalefonts #lesson-fragment li,
	.scalefonts #lesson-fragment li li,
	.scalefonts #lesson-fragment ol,
	.scalefonts #lesson-fragment ol ol,
	.scalefonts #lesson-fragment p p,
	.scalefonts #lesson-fragment table,
	.scalefonts #lesson-fragment td,
	.scalefonts #lesson-fragment ul,
	.scalefonts #lesson-fragment ul ul,
	.scalefonts #sbo-rt-content div div,
	.scalefonts #sbo-rt-content div p,
	.scalefonts #sbo-rt-content li,
	.scalefonts #sbo-rt-content li li,
	.scalefonts #sbo-rt-content ol,
	.scalefonts #sbo-rt-content ol ol,
	.scalefonts #sbo-rt-content p p,
	.scalefonts #sbo-rt-content table,
	.scalefonts #sbo-rt-content td,
	.scalefonts #sbo-rt-content ul,
	.scalefonts #sbo-rt-content ul ul {
			font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Meiryo, "source sans pro", Verdana, SeguoUI, Roboto, Oxygen, Ubuntu, Calibri, Tahoma, Arial, sans-serif !important;
	}
}