This is a black template as demo here: https://www.joomlart.com/demo/ja-mason have you tried to change, if there is a main setting for dark/white settings in the template admin etc otherwise you can use css to change your pro headers and more.
To change that background "pro header" you can for example use this code background-color: white; in your custom css file:
.t3-header {
border-bottom: 1px solid rgba(255,255,255,0.1);
padding-top: 40px;
padding-bottom: 40px;
background-color: white;
}
So this is personal customisations and not related to JBD directory. If you will or can not do css contact a design developer and you get exactly what you want but its not so difficult to change css so you got your colours as you want. https://www.w3schools.com/Css/css_intro.asp
Thanks Issue resolve!