body
{
  background: rgb(255, 255, 255);
  font-family: Arial,Helvetica,sans-serif;
  width: 90%;
  margin: 0;
  padding: 20px;
}
h1,h2
{
text-align: center;
}
header
{
background: white;
padding: 20px;
}
nav ul
{
list-style-type: none;
overflow: hidden;
background: #333;
margin: 0;
padding: 0;
}
nav li
{
float: left;
}
nav li a
{
    display: block;
    color: #FFF;
    text-align: center;
    text-decoration: none;
    padding: 14px 16px;
}
nav li a:hover
{
background: #111;
}
article
{

padding: 20px;
}
footer
{
background: rgb(255, 230, 230);
margin-top: 5px;
padding: 10px;
}