.img-fluid{
    z-index: -100;
    /* width: 100%;
    height: 400px; */
}
.text-center{
    align-content: center;
    margin-top: -20%;
}
.alignb{
    margin-top: -5px;
    margin-left: 42%;
    margin-right: 45%;
    -moz-box-align: center;
}