Yes, you need a different selector for that specific page, for example an ID or a class at the body element (or another element that’s different from the standard), and add that specific CSS rule somewhere below the current ones. For example, if your about us page has
<body id="about"> you can do:
Code:
body {font-family: 'Gill Sans', Arial, Helvetica, Sans-serif;}
#about {font-family: Palatino, 'Times New Roman', Times, Serif;}
h1, h2, h3 {
font-family: 'Arial Black', Arial, Helvetica, Sans-serif;
font-weight: 900;
}