booknara

div.classname {
    position:    absolute;
    left:        50%;        /* Start with top left in the center */
    top:         50%;
    width:       200px;      /* The div fixed width... */
    height:      100px;      /* ...and height */
    margin-left: -100px;     /* Shift over half the width */
    margin-top:  -50px;      /* Shift up half the height */
}

booknara

[
    "bbb",
    "ccc"
]