Cant remove border line from header

Hi,

I am trying to remove the faint grey borderline from my header using the following code, however, something always seems to be overriding it. Can anyone see, please?

Thanks

div.header-wrap {
border-style: none;
}

And it’s the same with the footer:

div.site-info {
border-style: none;
}

Any ideas appreciated. Thanks

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