algin content css

1.center_me {
2  display: flex;
3  justify-content: center;
4  align-items: center;
5}

11. Enclose the div that you want to center with a parent element 
2(commonly known as a wrapper or container)
3
42. Set “text-align: center” to parent element.
5
63. Then set the inside div to “display: inline-block”

1  
2    div
3 {
4  width: 70px;
5  height: 300px;
6  border: 1px solid #c3c3c3;
7  display: flex;
8
9      flex-wrap: wrap;
10  align-content: center;
11}
12