CSS stylesheet ediot only applies when logged in

Got it. WordPress only automatically loads Open Sans when a user is logged in, because WP uses that font for the Dashboard, which is why it works when you’re logged in, but not otherwise. You can load the Open Sans font in your child theme’s functions.php like this:

<?php

function child_theme_scripts() {
wp_enqueue_style( 'open-sans', '//fonts.googleapis.com/css?family=Open+Sans' );
}
add_action( 'wp_enqueue_scripts', 'child_theme_scripts' );

If your child theme doesn’t have that file, you should create it using a plain-text editor and then upload it to your child theme’s folder using FTP or cPanel or whatever file management application your host provides.

Also, you need to use quotes in your font rule: font-family: "Open Sans";.

Try this:

h2.title {
	font-size: 24px;
}

.home #main .title {
	font-size: 24px;
}

The first rule changes the font size for the post titles in the slider, and the second rule changes the font size for the post titles in the boxed sections further down the page (the sections labeled “Banking & Saving”, “Credit Cards & Loans”, etc.).