how to align items on center in angular w3schools code example

Example 1: how to align items in css

div
{
  display:flex;
  align-items:center;
  justify-content:center;
  
}

Example 2: 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; }