flex right align last item 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: display flex align last item to left

.speakers::after {
  content: '';
  flex: auto;
}