.cursos h1{
	text-align: center;
}
.cursos nav {
	border-bottom: 6px solid black;
	border-top: 6px solid black;

	border-radius: 2px;

	text-align: center;

	margin-bottom: 5px;
}
.cursos nav ul li{
	text-align: center;
	margin: 10px;

   font-family:arial;
   font-size: 20px;
}