If you using the “VK All in one Expansion Unit”
https://www.ads-software.com/plugins/vk-all-in-one-expansion-unit/
1. Admin page -> VK ExUnit -> Activate “CSS Customize”.
2. Admin page -> VK ExUnit -> CSS Customize page
3. Input below css after save.
example
.media .media-body h1.media-heading a { color:#8EC390; }
.media .media-body h1.media-heading a:hover { color:#8C93FF; }
h1.entry-title:first-letter { color:#8EC390; }
h1:hover.entry-title:first-letter { color:#8C93FF; }