Getting rid of blue backgroung in google mail

Can someone help me get rid of this blue background in google mail. It is driving me nuts

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The blu background did not come there by itself. You must have selected it on your own without noticing or someone has been snooping in your email. This is a very common problem that people face. When applying the setting you usually know where to find it but after that it dissapears into thin air no matter where you search for it. Open the gmail website andlogin using chrome. Chrome is the most preferred browser to use for accessing gmail. Both gmail and chrome were made by google incase you dod npt know. Snoop around the entire gmail webpage untill you find the setting. If none of this helps then kindly search for help on youtube, youtube will show you a step by step video on how to do it.