The main font in the Selkie theme - Nyght Serif Light - is used with italics.
If you don't like it and want to use the regular font (no italics), do the following:
- Go to your Blogger dashboard > Theme > click on "Customize"
- Expand "Advanced" > click on "Links" to expand the dropdown > scroll down to the bottom and select "Add CSS"
- Add this CSS to remove the italics everywhere:
h1, h2, h3, .header-widget h1, .slider-title, .entry-title, .archive-title, .contact-form button, #Image150 h3.title, .content-wrapper .Label h3.title, .content-wrapper .LinkList h3.title, .popular-post-title, .featured-post-title, .related-post-title, .post-navigation {
font-style: normal;
}