If you don't find a way to change it through any of the user interfaces (UI), then it must be done manually.
Yoo will need to locate the CSS file in the theme (usually styles.css), and search for the gradient_animation class
with a period before it, like this "
.gradient_animation" (without quotes). The period means
class, and the hash sign ("#") means
id.
If you do not find it, keep in mind that the theme may have other CSS files named differently, but all with the ".css" extension, or it may be located in one of the plugin folders. As soon as you find the class, anything after the curly bracket "{" will be the properties, including color and other things.
Example:
Code:
.gradient_animation {
background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
background-size: 400% 400%;
animation: gradient 15s ease infinite;
height: 100vh;
}
You will see in the example above that the "background: linear-gradient" has the orientation angle of the gradient and four colors in #RGB format (ex: #ee7752 is predominant in red, etc.) Those are the colors you will need to play with.
And in the "animation: gradient" line, you will have the animation duration time (15s), and the effect ("ease infinite").
Again, this is just an example. In your case, the coding could be different, but for that, I would need to see the files, something you could do yourself.
If in doubt, consult Google about the CSS rules so you can get the effect and colors you are looking for.
Cheers.