Hi Clay-
The colors of the “wedges” are generated by the color palette you find in Customize > Colors. There are three background colors that are created, background-primary, background-secondary, and background-tertiary, and they’ll work as expected if the blocks on the page go in that order.
All of that being said, Wedge doesn’t play very nicely when you’re using custom background colors for your blocks.
Taking a look at your site, since all of the blocks are a white background, you could use this Custom CSS rule in your Customize > Advanced > Custom JS & CSS:
.entry-content .bgtfw .container-fluid::before, .entry-content .bgtfw .container-fluid::after {
background-color: #fff;
}
On the other hand, you can also remove the wedges altogether using this rule:
.entry-content .bgtfw .container-fluid::before,
.entry-content .bgtfw .container-fluid::after {
display: none;
}