html {
    background: #F0F8FF;
    }
    
h1 {
  color: darkblue;
    text-align: center
}
    
h2 {
  color: darkblue;
    text-align: center
}

    
h4 {
  color: darkblue;
   
}
.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}