.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    height: 200px;
    width: 200px;
  }
h1
{
    text-align: center;
}
h2
{
    text-align: center;
  
}
h3
{
    
    text-align: center;
    text-transform: uppercase;
}