.loader-bx {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.7);
}
.loader-parent {
    position: relative;
}
.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    height: 100px;
}