Customising footer footer Twenty Twelve Footer

Hi

I’m using wordpress I’ve customised most of the twenty twelve theme. I want to be able to customise the footer. By 2 colours to it. However I have noticed that when trying to add colour to the footer it adds a border. (I have messed around with the border settings).

I have found the code below and added the one colour.

You might want to have a look at the site at https://www.itsdavid.co.uk

Any help would be great.

footer[role=”contentinfo”] {
border-top: 1px solid #ededed;
clear: both;
font-size: 12px;
font-size: 0.857142857rem;
line-height: 10;
max-width: 1000px;
max-width: 68.571428571rem;
margin-top: 24px;
margin-top: 1.714285714rem;
margin-left: auto;
margin-right: auto;
padding: 24px 0;
padding: 1.714285714rem 0;
background-color:black;

}
footer[role=”contentinfo”] {
text-align: center;
font-size: 80%;
}