Go to Theme option From WordPress admin menu:
Moon Theme Options > Appearance
There is 9 predefined brand color for your website. Just active any color and see the magic in front-end.
Custom Brand Color:
If this 9 predefined brand color does not suit your need, you can set your own brand color. Active “Custom Color” and set your desired color from the next field “Theme Color”.
You can enable or disable entire website’s preloader from this area. There is seven preloader style for your convenience. If you want to upload your own image, just sent “Custom Image” from the dropdown and upload your own image from the next field “Upload Preloader Image”.