how to center with magin code example

Example 1: css center

// example 1 
div { display: grid; place-items: center; }

// example 3
div{ display:flex; align-items:center; }

// example 3
div { width: 100%; margin: 0 auto; }

Example 2: how to horizontal center a div in css

#inner {
  width: 50%;
  margin: 0 auto;
}