normal

.container div:nth-child(2) { order: -1}

.container div:nth-child(2) { order: 1}

static order

.container  { 

            > div:nth-child(2) {
                order: 3;
            }

            > div:nth-child(1) {
                order: 2;
            }

            > div:nth-child(3) {
                order: 1;
            }
        }