How do I change the color of the add to cart button?

Hi, I do not have a theme.scss.liquid only a styles.css.liquid. How do I change the color of my add to cart button and its text without changing all of my other buttons? Also, this is unrelated, but how do I change the size of product pictures and the header on the product page without changing it on desktop? My website is www.luxoptions.com

Thanks for any help

@luxoptions - what color do you want for the add to cart button?

@suyash1 @I would like it to be black

@luxoptions - add this css to the very end of styles.css file and check

button.button--add-to-cart, button.button--add-to-cart:hover {
    background-color: #000 !important;
    color: #fff !important;
}

Hi @luxoptions

This is Victor from PageFly - Landing Page Builder App.
You can go to Online store => themes => actions => edit code and add this code on file styles.css

button.button.ajax-submit.action_button.button–add-to-cart.action_button–secondary{
background: black !important;

color: white !important;

}
Hope this answer helps.
Best regards,
Victor | PageFly team