body {
  background-image: url;
  }
h1 {color:darkblue;}
h2 {color:red;}
h3 {color:white;}
h4 {color:brown;}
h1,h2, h3,h4 {text-align: center;}
p {text-align: center;}
a:link {color:green;}    /* unvisited link */
a:visited {color:#556B2F;} /* visited link */
a:hover {color:#FF00FF;}   /* mouse over link */
a:active {color:#0000FF;}  /* selected link */
img.center { 
    display: block; 
    margin-left: auto; 
    margin-right: auto;
}