/* site.css */
header{
		font-family: 'Times New Roman', serif;
					}

footer {
	position: fixed;
	bottom: 20px;
	color: white;
}


h1{
	color: orange;
}

h2{ 
	color: orange;
}

h3 {
	color: orange;
}

a:link {
	color: lightgreen;
}

a:visited {
	color: lightblue;
}
<h1 style="text-align: center;"><IT Knowledge Base(KB)</h1>

		body {
			font-family: sans-serif, Arial, Helvetica;
			font-size: 14px; 

		}