chrome inspector showing flashing on body tag

I can see in the inspector that the body tag is constantly flashing. I think this happens when the dom is manipulated so when the page is first loaded, all elements flash purple once then settle. For some reason my body tag remains flashing purple indicating it is still being updated.

Any ideas?

enter image description here

How do I force inspect element in Chrome?

At the top right corner, click on three vertical dots. From the drop-down menu, click on More tools -> Developer Tools. macOS users can use the shortcut – command + option + C and Windows users can use Control + Shift + C.

Like an idiot I forgot I had a slider on the page....constantly updating the dom.

:D