how to move h in center css code example

Example 1: center h1 css

h1 {
    width:500px;
    margin: 0 auto;
    background: gray;
    text-align: center;
}

Example 2: css position element in the middle of a header

P.blocktext {
    margin-left: auto;
    margin-right: auto;
    width: 200px;/*usually works best with a fixed width*/
}