text align center in flexbox code example

Example 1: css flex center

display: flex;
align-items: center;
justify-content: center;

Example 2: center div css flex

section {
  width: 200px;
  border: 1px solid #2d2d2d;
  display: flex;
  justify-content: center;
}

Example 3: how to horizontally center header at the top of page with flexbox css

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