How to change font color?

I would like to change the body text on my pages and posts to white, as well as the links in the sidebar. I can not figure out how to do this. My site is
www.celebrateyourflaws.com

Also at the bottom of my homepage, the subscription box takes up the length of the page. Is there any way I can format it to be smaller? Thanks.

Hey there

I hope you are well today and thank you for your question.

You can try achieving this by adding the following CSS code in the Custom CSS option of your theme on the below path.

Admin Area -> Appearance -> Customize -> Additional CSS

/* change text to whtie*/
div.entry-content p, div.entry-content h3, h1.entry-title, h1.entry-title,div.entry-content h4,div.entry-content h2, div.entry-content h5, li.cat-item a, h2.widget-title,.page ul li a, span.post-date, a.tag-cloud-link {
    color: #ffffff;
}

Best Regards,
Support

This worked for the body text, but not for the sidebar links. Thank you so much!

Hello there,

Please try adding the following CSS code:

/*Side bar text color*/
aside#secondary span, aside#secondary h2, aside#secondary a {
    color: white;
}

Best Regards,
Support