Hi there, you can change the colour of specific headings within your post by following this example, which would affect h3 tags (Heading 3):
.entry-content h3 {
color: #bb00bb;
}
You can add other CSS rules to change the colour of different headings individually, or if you’d like to change them all to the same colour, this should do the trick:
.entry-content h1, .entry-content h2, .entry-content h3, .entry-content h4, .entry-content h5, .entry-content h6 {
color: #bb00bb;
}
Replace #bb00bb with whatever colour you like.
Learning how to target your site’s CSS will help you make certain design and layout changes. Here are some very helpful posts that will help you customize your site with CSS:
https://dailypost.wordpress.com/2013/07/25/css-selectors/
http://dailypost.wordpress.com/2013/06/21/css-intro/
http://dailypost.wordpress.com/2013/08/29/css-matched-rule-pane/
http://en.support.wordpress.com/custom-design/how-to-find-your-themes-css/
Let me know how it goes!