In the Twenty Ten parent style.css, I see this:

#access li:hover > a,
#access ul ul :hover > a {
background: #333333;
color:#FFFFFF;
}

In the child theme I have made, I have commented out this:

/*background: #333333;*/

But still when I hover over any menu item, I see the black hover background: #333333;. How do I get rid of it?

I don't want to modify the parent style.css, because that will defeat the purpose of having created the child theme.

I have unsuccessfully tried to solve this for a long time now. I am not a dev, programmer or a geek. Please guide someone. Thanks.

You need to override the value as it's currently set..

So rather than commenting out the background portion (which basically leaves it as it's current black setting), set it to a new value, ie..

Set to white background.
#access li:hover > a,
#access ul ul :hover > a {
background: #fff;
}
Transparent
#access li:hover > a,
#access ul ul :hover > a {
background: transparent;
}
Hope that helps..

hank you Mark so much for your help.

background: transparent; overrides the current black value.

BUT, when point on the dropdown submenu, it disappears!

Please guide me so that the dropdown submenu does not disappear when I point on it. Thanks again.

The submenu problem is not caused by the above changes, that's a seperate problem.

Can you link to the site so i can see the issue?