@Klaas: Catch Everest default theme is sans-serif and when using inherit, it will load the default font.
Changing font is nice and cool in Pro version as you will get option to use all Web Safe Fonts and popular Google fonts from “Appearance => Theme Options => Font Family Options”
The Arial font is web safe font. So, to change the title fonts you can add in the following css in “Appearance => Theme Options => Custom CSS” box.
.entry-header .entry-title {
font-family: Arial, sans-serif;
}
For the sidebar widget link color, you can add the following css in “Appearance => Theme Options => Custom CSS” box.
.widget-area .widget a {
color: #404040;
}