Change font color from dark grey to black?

How do I change the font color from the current dark grey shade to all black? Also is there a way to widen the website on the whole, so it takes up more horizontal space when viewing the website?

 

Hello,
Paste the following code in your Custom CSS
(Appearance -> Theme Options -> Styling Options -> Custom CSS)

Code:

body,p,a,h1,h2,h3,h4,h5,h6,span,.infotag,.textwidget,li,ul,label{
color:black ! important;
}

This will solve your issue.