Hi Laura,
You asked me to activate Kleo .. I’m not sure if you mean to turn it on in Appearance > Themes > Kleo Child, or if you mean to provide proof of purchase, which I have done in Theme options > Theme Update and put in the Themeforest API Key..
Anyway I’ve applied a workaround which solved the problem. In Appearance > Customize > Additional CSS I added:
html {
margin-top: 0px !important;
}
This removed the white top bar from the Child theme.