flex box center css code example
Example 1: flexbox align right and left
.primary-nav {
display:-webkit-flex;
display:flex;
list-style-type:none;
padding:0;
justify-content:flex-end;
}
.left {
margin-right:auto;
}
Example 2: center div css flex
section {
width: 200px;
border: 1px solid #2d2d2d;
display: flex;
justify-content: center;
}