h1{text-align: center;}
nav
{
    background-color: green;
    text-align: center;
}
h2
{
    text-align: center;
    color: crimson;
}
p{text-align: center;}
header
{
    background-color: yellow;
    font-size: 40px;
}
*{
    margin: 0;
    padding: 0;
}
footer
{
    font-size: 10px;
    bottom: 0;
}
a
{
    text-decoration: none;
}