Two Grey/white bands on site? need to be removed or changed to black?

Hi, I have just changed the theme from original parent to child theme - see . as a result there are now some white stripes on the top and bottom of the page which have appeared. not sure why.
Would it be possible to see if they can be removed? either through CSS ? or another way please?

(seems to affect all pages) + some pages affects more area than just strips

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(please dont post any Images / Brand / Domain links etc here please use for links and to upload temporary images with links ) - this is due to google finding away to link brand name to wpmudev posts which is really annoying and causing multiple issues)