Position

.holder{
    position: relative;
    border: 1px solid #777;
    min-height: 500px;
}
.text{    z-index: 9999; }
.box{
    top: 0;
    left: 30px;
    width: 50px;
    height: 50px;
    z-index: -1;
}
.static{
    position: static;
    background: #AAF;
}
.absolute{
    position: absolute;
    background: #AFA;
}
.relative{
    position: relative;
    background: #FAA;
}
.fixed{
    position: fixed;
    background: #FFA;
}