how to make things center using css

1// add to the parent element
2.parent{
3  	height:100vh;
4	display:flex;
5  	justify-content: center;
6  	align-items: center;
7}
8or you can use 
9// add to the parent element
10.parent{
11  	height:100vh;
12	display:gird;
13  	place-item:center;
14}

1// add to the parent element
2.parent {
3	display: grid;
4    place-items: center;
5}