Edit Main Content Font

I can easily see how to change the font from the Enfold theme settings in the Dashboard; however, there’s not an area under General Styling / Main Content that let’s you control the Font Size. Am I missing something? How do you edit it? And if it must be done through the Quick CSS box below … what is the exact name of the main content / body content area that I need to use? For instance, is it .main-content-area or something like that and therefore would be:

.main-content-area {
font-size: 26px;
color: #5f9ed3;
}

Thanks!