@Carina: The css that you have added is messed up. Also you are not supposed to add in Webfont script in Custom CSS box. This place is only for CSS and for Script you can use “Code to display on Header” from “Appearance => Theme Options => Webmaster Tools => Header and Footer Codes”.
In you first css there is missing }. So, to remove the border, replace the following css from Custom CSS box
.featured-image img, .entry-content img, .comment-content img, .widget img, img.header-image, .author-avatar img, img.wp-post-image {
box-shadow:rgba(0, 0, 0, 0.2) 0 0 0;
And add the following instead.
.featured-image img, .entry-content img, .comment-content img, .widget img, img.header-image, .author-avatar img, img.wp-post-image { box-shadow: none; }
Note: As per the license, you need to attribute all the Free theme that you use. I see that you have removed Theme: Catch Everest from your Footer. Please add it back as we this is only means of recognition that we receive for our hard work of Free Theme and Free Support. To edit Footer text, I recommend you to upgrade to pro version where you have Footer Editor option to edit the text.
.
