#step_1 {
    position: absolute;
    width: 420px;
}
#step_2 {
    display:none;
    position: absolute;
    width: 420px;
}
#step_3 {
    display:none;
    position: absolute;
    width: 420px;
}
#step_4 {
    display:none;
    position: absolute;
    width: 420px;
}