how to center a header in css code example

Example 1: header center

div {
  width: 100%;
  height: 200px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: blue;
}

text {
  background: orange;
}

<div>
   <text>Centered horizontally and vertically</text>
</div>

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*/
}

Example 3: how to center a html header

h1{text-align: center;}

Example 4: how to horizontally center header at the top of page with flexbox css

.box.flex {
  display: flex;
  justify-content: center;
}