Parallax background flashing white as I scroll

The site in question:

Put the blue or green parallax section into view and scroll up and down. You will notice white flashes on the top or bottom edges of the colored sections.

This white flash seems to be the body color seeping through. If you change the body color to black, for example, the flashes of white will turn into flashes of black.

Is there anyway to fix this?

Hi @tedmcdo,

I hope you are well today and thanks for posting here.

I could confirm the issue therefore notified the theme developer about this so that it will be fixed in the future version of theme.

In the meanwhile to resolve the issue on your site try adding the following CSS code in the Custom CSS option of your theme on the below path.

Admin Area -> Appearance -> Customize -> Shapely Options -> Other

html body {
    background: #3daf55;
header#masthead {
    background: #fff;