Social media icon centre

Hi Guys just a quick question, i would like to create social media icons on a coloured background. I am using the icon element and select the appropriate icon colour but the actual letter of Facebook or twitter or whatever isn’t the white letter it should be but rather the background colour i set in the colour background section.. any ideas?

Also we would like to create news letters by using the posts in wordpress, is it possible to see the full HTML of the advanced layout builder in such a way that it would work in emails?

thank you