CSS code colour won't change

Hi all,

I have this code in my child theme:

div.post {
font-family: ‘HelveticaNeue-Light’;
}
.post p {
font-family: ‘HelveticaNeue-Light’;
}

#submit,
#error-search,
#searchBtn,
#primaryContent h1.postTitle a,
#primaryContent h2.postTitle a {
background: none;
background-color: #000;
}

#submit:hover,
#error-search:hover,
#searchBtn:hover,
#primaryContent h1.postTitle a:hover,
#primaryContent h2.postTitle a:hover {
background: none;
background-color: #97cdb7;
}

I am trying to switch the colors around (to the color codes showing in the codes above) but the change won’t show on my blog. Can anyone see anything wrong with this set of code?
Thanks!