.md-fab-bottom-right {
    position: fixed !important;
    right: 15px; /* Add this and change value to set the margin you want */
}

.busy-Overlay {
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    bottom: 50%;
    margin: auto;
    background-color: transparent;
    color: #FFF;
    z-index: 5;
}